The computer's failure is common. There are many faults to diagnose, especially hardware failures, especially for hardware failures, and can use the alarm sounds and screen display information issued during the computer launch. The type and rule method of common hardware failure will be described below in accordance with the launch process of the computer.
Boot phase
The first step in which the computer started is of course turning on the power, and the system performs self-test and initialization under the control of the motherboard BIOS. If the power is working properly, you should hear the sound of the power fan transfer, the power indicator on the chassis is bright; the "Numlock" and other three indicators on the hard disk and keyboard are bright (then go out); the display is also Send a slight "唰" sound (which is much smaller than the sound of the degree of sound), which is the sign sent by the display card signal. This stage is common, there is: the fan does not rotate, and it does not see the power indicator light. It is definitely a power problem. You should check if the power plug behind the chassis is inserted, and you can pull out to reinsert it. Of course, the power socket, UPS fuse, etc. should also be carefully checked that the power indicator is on, the screen is no response, no alarm. You should focus on check the motherboard and CPU. Because the system is controlled by the motherboard BIOS, the computer does not issue alarm sound before the basic self-test, and the screen does not display any error prompts. At this point, you should check from the following aspects:
(1) Check the Flash ROM chip on the motherboard, re-press it after turning off the power, making it good contact;
(2) Check the motherboard BIOS chip, it is possible to be unsuccessful by CiH virus attack or BIOS upgrade;
(3) Check the CPU and can be determined by the replacement method;
(4) Check the memory strip, re-insert it backward after turning off the power, further confirming that it is good or bad;
(5) Check if the non-standard outer frequency is used. If you use a 75MHz, 83MHz and other non-standard outer frequencies, the quality of the graphics cards may pass, but the standards of 66MHz, 100MHz should be used;
(6) Chassis production rough, reset button is pressed or inside the inside, so that the reset button is in the working state. You can check it with a multimeter or unplug the RESET jumper on the motherboard;
(7) Check the motherboard power supply. The power indicator is on, and the hard disk indicator does not extinguish. Note that there is a problem with the hard disk, there are two possibilities: First, the hard disk data cable is inserted; the second is that the hard disk itself has physical failures and should be replaced. Detection of fatal hardware fault testing Detection CPU, internal bus, basic memory, interrupt, display memory and ROM and other core components. At this point, the fault location can be determined by the number of "beep" sounds emitted by the speaker. Commonly known:
The computer issued 1 long 1 short alarm. Explain that the memory or motherboard error is wrong, try a memory.
The computer issued 1 long 2 short alarm. Description Keyboard controller error, check the motherboard.
The computer issued a 1 long 3 short alarm. Note There is an error in the presence of a display or display card. You can turn off the power and check the display
Whether the station and the display plug and the like are in good contact or use the replacement method to determine if the graphics card and the display are damaged.
The computer issued a 1 long 9 short alarm. Description Motherboard Flash ROM, EPROM error, or BIOS damage, and further independently
It is necessary to pay attention to the model motherboard.
The computer issued a repeated short noise. Explain that the motherboard power is problematic.
The computer issues an uninterrupted long "beep" sound. Note that the system detects that there is a problem with the memory, and should turn off the power to reinstall the memory.
Articles or replace the new memory bar retry.
Non-fatal hardware fault test
The system issues a "beep" indicates that the start-up phase is normal and no deactivated hardware failure, and enters the non-fatal hardware fault test phase. At this time, the screen displays the graphics card model, the motherboard BIOS information, memory detection information, and more. If the self-test is interrupted, the fault location can be determined according to the screen prompt: IDE interface device detection information is:
Detecting Primary Master ... None
Detecting Primary Slave ... None
Detecting Secondary Master ... None
"Detecting Secondary Slave ... Philips CD-ROM Drive 40X Maximum"
Indicates that the two IDE interfaces do not find the hard drive, indicating that the hard disk is not connected or the hard disk is faulty, and should check from the following aspects:
1 Hard disk power supply is electrically or contact;
2 If the hard disk interface line is reversed, loose;
3CMOS has no error, enters CMOS check "Primary Master", "Primary Slave", "Secondary Master", the most reliable way to do not match the hard drive, the most reliable method is to put these three "Type" They are set to "auto";
4 hard disk itself physics malfunction.
In the IDE interface device detection information, "FLOPPY DISK " "error message is displayed, indicating that there is a problem with the floppy drive specified by CMOS. Possible issues are:
1 If there is a problem with the floppy drive, the power cord is electrically or negative with the floppy drive interface;
2 Soft drive data cable is reversed, loose;
3CMOS setting error, enter the type of "Drive A" in CMOS, such as the type of floppy drive is not in response to reset, and is generally "1.44M 3.5 in."
4 floppy drive itself physics failure.
The CMOS Battery State Low CMOS battery voltage is too low and should be replaced.
The BIOS check and read error in CMOS Checksum Failure CMOS should be re-running the CMOS Setup program.
CMOS System Option Not Set
The CMOS system is not set.
CMOS Display Type Mismatch
The setting of the display type in CMOS is inconsistent with the measured, which should be reset.
Display Switch Not Proper display mode jumper setting error on the motherboard.
Keyboard is lock. . . UNLOCK IT keyboard is locked, re-boot the system after opening the lock.
Keyboard Error keyboard timing is wrong.
KB Interface Error keyboard interface error.
The main memory on the CMOS Memory Size Mismatch motherboard is different from the CMOS.
FDD Controller Failure BIOS cannot exchange information with floppy drives, check the FDD control card and cable.
HDD Controller Failure BIOS cannot exchange information with hard drive, check HDD controllers and cables.
Cdrive Error BIOS does not receive a response signal from the hard disk C, check the settings of the hard disk type in CMOS Setup or run "Hard Disk Utility" lookup problem.
The DDrive Error BIOS does not receive the response signal from the hard disk D, the processing method is the same.
The CDrive Failure Hard Drive C does not respond to host information, check or replace the hard drive C.
Ddrive Failure Hard Disk D is no response to the host, check or replace the hard drive D.
The time and date in the CMOS Time & Date Not Set CMOS are not set, and the setup should be set. Cache Memory Bad dot Enable Cache Board Cache Bad, should be replaced.
8042 Gate A20 ERROR 8042 chip is bad, it should be replaced.
Address Line Short Motherboard Add Code Circuit Fault.
DMA # 2 ERROR Memory directly accesses the No. 2 channel error.
DMA # 1 Error memory directly accesses the No. 1 channel of the DMA.
DMA Error DMA controller is broken, it should be replaced.
NO ROM Basic When the boot sector on the floppy drive or hard disk can't find it, the BIOS tries to enter the ROM Basic program failed.
The system boots in the Diskette Boot Failure flies are broken.
Invalid Boot Diskette reads the floppy boot program error, try again.
On board Parity Error motherboard memory parity, the error address is given in the second line, the format is: addrhex = .
Off board Parity ERROR Memory Dip Card on the Memory Extended Card on the Memory Patement I / 0 Bus Extended Slot, the error address is given in the second line, the format is: addrhex =.
Parity Error? The parity parity, but its address cannot be determined.
The screen displays the "Keyboard Error or No Keyboard Present" error message, indicating that the keyboard has problems. general
It is a problem with the keyboard line and the motherboard interface. After turning off, the keyboard line is removed and re-insert; if it is still turned on, still
This information, this shows that the keyboard itself has faults.
