System CMOS/BIOS Configuration PC Diagnostics

Transcription

1 System CMOS/BIOS Configuration PC Diagnostics (POST; Error Messages and Error Codes) CMOS/BIOS Complementary Metal Oxide Substrate (CMOS) A part of the motherboard that maintains system variables in static RAM. It also supplies a real-time clock that keeps track of the date, day and time. CMOS Setup is typically accessible by entering a specific sequence of keystrokes during the POST at system start-up. A type of chip able to operate with a tiny trickle of electricity from a battery. The term also refers to the contents of a CMOS chip on the motherboard, which holds information about the system and its peripherals even while the system is turned off. Roger Embalsado Page 1

2 Basic Input/Output System (BIOS) It is the built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions. The BIOS is typically placed in a ROM chip that comes with the computer (it is often called a ROM BIOS). This ensures that the BIOS will always be available and will not be damaged by disk failures. It also makes it possible for a computer to boot itself. Because RAM is faster than ROM, though, many computer manufacturers design systems so that the BIOS is copied from ROM to RAM each time the computer is booted. This is known The PC BIOS is fairly standardized, so all PCs are similar at this level (although there are different BIOS versions). Additional DOS functions are usually added through software modules. This means you can upgrade to a newer version of DOS without changing the BIOS. PC BIOSes that can handle Plug-and-Play (PnP) devices are known as PnP BIOSes, or PnP-aware BIOSes. These BIOSes are always implemented with flash memory. o Standard CMOS Setup Date, hour, HDD operating mode (Normal, LBA, Large), video card, and floppy drive. o BIOS Features Setup These are common features: Virus warning. CPU level 1 cache. CPU level 2 cache. CPU level 2 cache ECC checking. Quick power-on self-test. Boot sequence. Swap floppy drive. Boot-up floppy seek. Boot-up Numeric Keypad lock status. IDE HDD block mode. Security options. Roger Embalsado Page 2

3 o o o o o Chipset Features Setup This menu is used to modify the contents of the buffers in the chipset on the motherboard. Since the parameters of the buffers are closely related to hardware, the motherboard may become unstable or you may not be able to boot up if the setup is not correct. If you don't know the hardware well, use default values. Power Management Setup The difference between Green PCs and traditional computers is that Green PCs have a power management feature. With this feature when the computer is powered on but inactive, the power consumption is reduced in order to save energy. When the computer operates normally, it is in Normal mode. In this mode, the Power Management Program will monitor the access to video, parallel ports, serial ports, and drives and the operating status of the keyboard, mouse and other devices. These are referred to as Power Management Events. In cases when none of these events occur, the system enters the Power Saving Mode. When one of these events occurs, the system immediately returns to normal mode and operates at its maximum speed. PCI & Onboard I/O Setup In this menu, you can change the INT# and IRQ of the PCI bus and the onboard I/O devices, I/O port addresses and other hardware settings. Password Setting This option allows you to set a password required to start the system or to access to the BIOS setup. IDE Hard Disk Drive (HDD) Auto Detect After you have installed the hard disk in an old system, you had to know the hard drive specifications, such as the number of cylinders, heads, and sectors, and to enter the relevant information into the hard disk information section of BIOS. If the CMOS data were erased and you had forgotten the hard disk specifications, it creates a big program. Nowadays, you can use this option to auto detect the hard disk type and specifications, and the BIOS will automatically detect all the relevant information and place them in the Hard Disk Data section of the Standard CMOS Setup Menu, in order to allow you to use your hard disk. PC DIAGNOSTICS POST When a computer is turned on, the hardware runs a Power-On Self Test (POST). If errors are encountered during this POST test, they are usually displayed via an audio beep or in the form of a code number flashed across the screen. With this audio code in hand, you can determine what part of the system is having problems and find a solution. Roger Embalsado Page 3

4 1 short beep Normal POST - system is ok 2 short beeps POST Error - error code shown on screen No beep Continuous beep Power supply or system board problem Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem 1 long, 1 short beep System board problem 1 long, 2 short beeps Display adapter problem (MDA, CGA) 1 long, 3 short beeps Enhanced Graphics Adapter (EGA) 3 long beeps 3270 keyboard card Error Messages- are messages often caused by software or program instability. Roger Embalsado Page 4

5 What are the Common causes: 1. Corrupt Operating System 2. Virus Infection 3. Defective RAM For Error messages, restart PC, scan for viruses if problem persists, shut down Pc and check for any hardware changes or defective hardware components. To be sure, reinstall your operating system afterwards. Booting Errors-as opposed to windows loading errors-usually report problems with a specific device. Roger Embalsado Page 5

6 KEYBOARD BASED ERRORS Keyboard errors can happen for a few different reason: 1. Dead keyboard 2. Malfunctioning keyboard (loose keyboard connection, stuck key/s, moist). 3. Dead keyboard controller For a dead keyboard, shut the pc down remove the current keyboard and replace it with a working keyboard. A malfunctioning keyboard needs to have its specific problems resolved before it can be expected to work again. A dead keyboard controller on the other hand, isn t as simple as buying a replacement keyboard since the controller is located on the motherboard itself. Drive-Related errors These errors usually occur because the pc cannot get a response from a needed drive such as your booting hard drive or the drive does not recognize that it is attached to the pc. Roger Embalsado Page 6

7 SYMPTOMS OF A DEAD OR DYING HARD DRIVE: 1. Horrific or loud noises that involve brr-ing or buzzing, clicking, grinding or scarping sounds. 2. Loud vibration (although this can be caused by a drive that is not securely mounted on its drive bay). 3. No drive light (If instead, the drive light remains on all the time,this is usually a sign of a reversed cable, which can fry the drive). 4. Smoke, Sparks, or a strange odor coming from the drive. 5. Drive not being detected by the BIOS. A drive shows garbage, corruption or confusion after an event like a serious power surge Repeated drive errors All other drives respond with the PC turned on except for the suspected drive It takes 2 or 3 restarts to get the Hard drive to respond when starting up the PC. BASIC TROUBLESHOOTING TIPS AFTER INSTALLING A NEW HARD DRIVE 1. If you have installed your drive and it does not function properly, perform the following basic checks: Warning: Always turn off the computer before changing jumpers or unplugging cables and cards. Wear a ground strap or use other antistatic precautions while working on your computer or handling your drive. Verify compatibility. Verify that the host adapter and drive are appropriately matched to each other and to your computer. Refer to the relevant documentation for details. Check all cards. Verify that all cards are seated in their slots on the motherboard and secured with mounting screws. Check all connectors and cables. Make sure all ribbon and power cables are securely connected. Ribbon cables are easily damaged, especially at the connector. Try a new cable that you know is good. Make sure no connector pins are bent. Verify that pin 1 on the interface cable is aligned with pin 1 on the drive and host adapter. Verify jumper settings. Review the instructions in this guide and in your host Roger Embalsado Page 7

8 adapter installation guide. Make sure all appropriate jumpers are installed or removed as necessary. Check your power-supply specifications. Each time you add a new device to your computer, make sure your cornputer's internal power supply can support the total power demand. If necessary, consult your dealer for a new power supply. Verify the drive-type settings in the system setup program. The drive-type settings in the system BIOS must not exceed the physical specifications of your drive. Also, the settings must not exceed the limitations set by the operating system and BIOS. Check for viruses. Before you use someone else's diskette in your system for the first time, scan the diskette for viruses. 2. After you install your new drive, your computer will not boot, and no error message appears on the screen. Check your computer manual or BIOS manufacturer to determine whether your BIOS supports drives that have more than 4,092 cylinders. If your system has this limitation, use the following procedure to configure your computer: Turn off your computer, open the case, and remove your new drive. CAUTION: To avoid electrostatic discharge damage to your computer or hard drive, make sure you are well grounded before touching the drive, cable, connector or jumpers. 1. Move the jumper on the alternate-capacity jumper, This causes the drive to appear to your BIOS as having a 2.1-Gbyte capacity (4,092 cylinders, 16 heads, 63 sectors per track). You may need third-party partitioning software, such as Disk Manager, to achieve full capacity of the drive. 2. Remount your drive in the computer and replace the computer cover. 3. Insert a bootable system diskette into drive A and turn on the computer. It should boot from drive A and automatically detect the new drive as a Gbyte drive. 3. The screen remains blank when you power up the system. If the steps listed above do not remedy this problem, try the following: Make sure the monitor is plugged in and turned on. Check all cards. Make sure the video card is seated in its slot and secured with mounting screws. Roger Embalsado Page 8

9 Turn off the computer and remove the drive host adapter. If the screen turns on after you reboot, the host adapter may be incompatible or defective. If so, see your dealer. 4. The system does not recognize the drive. Check all cables. Make sure the power supply is adequate for system needs. Reboot the computer and listen to make sure the drive motor starts up. If the drive is very quiet, it may be difficult to hear its discs reach operating speed. If the drive motor does not start up, recheck all drive cables. Verify that for each drive, a drive-type is listed in the system setup program. 5. The dealer partitioned and formatted the drive for you in the store, but the drive does not respond when you install it. Reboot the computer and make sure the drive spins up. Check all cables. Make sure the power supply is adequate for system needs. Make sure the DOS or Windows version the dealer used to partition and format the drive is the same version you have installed in your computer. If it isn't, see your dealer. Verify the drive-type values in the system setup program. You must install the drive using the same drive-type values your dealer used to partition the drive. Check for 1/0 address conflicts between peripheral cards. Check for viruses. 6. The system hangs in FDISK or fails to create or save the partition record. Check all cables. Your setup system diskette may be corrupted. Try using a backup diskette. Make the partitions smaller. Change the interrupt jumper setting on the host adapter. Some BIOS have a Track 0 protection feature that protects Track 0 from viruses. This may cause FDISK to hang the system. You must disable this feature in the system setup program before you can use FDISK. See your computer reference guide for assistance. Be sure to re-enable this important feature when FDISK is done. 7. The system error message, "Drive not Ready," appears. Check all cable connections. Make sure pin 1 of the drive is connected to pin 1 of the hard-disc controller or host adapter. Make sure the power supply is adequate for system needs. Reboot the computer and make sure the drive spins up. Roger Embalsado Page 9

10 8. The FDISK error message, "No Fixed Disk Present," appears. Make sure the power supply is adequate for system needs. Verify the drive-type values in the system setup program. Check for 1/0 address conflicts. 9. The drive does not format to full capacity. Verify the drive-type values in the system setup program. One of the following problems may have occurred: The values may be set with an incorrect translation characteristic. You may have entered a parameter value that exceeds the physical capacity of the drive. You entered a translation characteristic that does not take full advantage of the drive's capacity. The drive's physical specifications exceed the translation limits imposed by the BIOS. CAUTION: If you change the drive-type values in the system setup program, you must partition and format the drive again. This erases data on the drive. If you have partitioned the drive into individual logical drives, you may need to make the partitions smaller to access the full drive capacity. If your computer supports LBA mode, you may need to enable LBA mode in the system setup program to access the full capacity of the drive. Refer to your computer's reference guide to find out how to enable LBA. Your computer may not support drives that have more than 4,092 cylinders. Follow the instructions on page 25 for After you install your new drive, your computer will not boot, and no error message appears on the screen. 10. The DOS message "Disk Boot Failure," "Non-System Disk" or "No ROM Basic - SYSTEM HALTED" appears. Reinstall the DOS system files using the DOS SYS utility. Check all cables. Use FDISK to verify that the primary partition is active. Check for viruses. 11. The system error message, "HDD controller failure" appears. Confirm the jumper settings on the drive. Verify the drive-type settings in the system setup program. Roger Embalsado Page 10