自检开机不自检原因（Boot no self check reason）

开机不自检原因Boot no self check reason

The screen has an image display, but the self-test processcannot be completed

1, BIOS chip fault or BIOS is destroyed by virus

When the host is powered on, the BIOS code program is initiallyadded. First, the systemreads the first instruction in theBIOSinto memory and explains the execution. The instruction,whether AWARD or AMI, is the same for a 3 byte jump instruction.The next step is to read the BIOS bootstrap block to completethe detection and loading of the BIOS itself. Only when thesystem reads the BIOS code into memory, CPU will execute theself-test and startup process in accordance with the codeprogram.

BIOS does not have many failures. Occasionally, the BIOS chipsfail because of aging and some storage units fail, so that theprogram code is incomplete, and the function calls of the systemcannot be completedproperly. Also, like the CIHvirus, rewritethe motherboardBIOS malicious code, cause the host can not boot,boot the host to normal power, fan, but was unable to completethe process of self display at the same time, the text display,the host and the alarm sound; of course, may be the only seriouspower, no image display, but also the host no alarm.

2, graphics card failure

Graphics card BIOS damage or AGP communication circuit failure,will appear when the video card initialization can not becompleted, leading to the host in the boot, the screen stays

at the video card for a long time, BIOS self-test can not passthrough the crash.

Note: the use of two or three years of board, especially foruse in Internet cafes in the machine, because the machine longtime high temperature f ilter capacitor CPU around by baking andloss, caused by the AC component CPU power supply increase inperformance for the machine in the start is not easy, requiresmultiple boot occasionally to boot into the desktop, often thecrash in the process of self, the fault is unstable andchangeable.

3, BIOS self-test

After the system has completed the self checking of the videocard, it will begin to check the BIOS code. The display willusually display the version number of BIOS and the type ofmainboard.

4, CPU L2 or L1CACHE is not completely damaged or CPU othercircuits appear aging

When the host completes the initialization of the video card,then begin to check the CPU self check. When CPU' s L1 or L2 fails,it will stagnate at "CHECK NVRAM. . . " for a long time. When thisfault occurs, some of the machines can also access the CMOSsettings, so we can manually turn off CPU' s L1 and L2 and tryagaintosee if themachine canpass the self-test. If possible,the CPU is basically slow to use. If not, you can only replaceCPU to solve the problem.

Most of the time when CPU appears to be partially corrupted,it often appears as a system report BIOS error (the class isdamaged by CIH virus) , L1 or L2 error, can not pass through selfcheck, can only enter the security mode, restart automaticallyduring the startup and so on.

5, memory failure

After the system has completed CPU testing, the memory testphase is carried out. If we shut down the POST quick detectionoption, we can't see the long memory test interface (threeconsecutive times) when we turn on the machine and only haveone test.

The memory chip is faulty or the memory slot deformation andbad memory, memory finger oxidation, memory slot metal reeddeformation or fracture, low or high voltage power supplymemory will appear to crash through the memory test.

6, PNP device initialization

7, the system can not complete the IDE device testing

1) both ends of the hard disk data line are hard to contact withthe hard disk or the main board, the connection is not real,or the quality of the hard disk is poor, and the part of theground wire is broken.

2) hard disk, CD drive part of the damage, resulting in the hostcan not complete the self-test process, leading to the host cannot start.

3) CD-ROM line reverse, the system self-test time becomeslonger, and even the CMOS settings will crash.

4) CD-ROM or hard disk master disk or hard disk capacity limit,jumper settings errorwill also lead to the system can not passself-test.

5) the M266A motherboard, like Hua Yang, must require 80 pinhard disks and hard drives to be set up on the IDE1. If we setthe hard disk on the IDE2, we will call the police during theself-test and the system will hang up.

6) in general, CD-ROM is hung on the IDE2 interface,

But the new function board will advise the machine when it ison its own. If the MSI MS-6368 motherboard is self checking,if we do not use the DMA66 data line, there will be hints asshownbelow, but the systemwill still be able to boot properly.Note: if the ESCD data is not updated, it will not affect thesystemself check. The new added settingswill not be identifiedby the system during self inspection, and there will be noexception in the self-test.

8 floppy drive wiring error or CMOS floppy drive setting errorFor floppy drive lines, the floppy drive will always turn on,but it doesn' t affect the system' s normal boot.

If the software AB drive setting error in CMOS or floppy disk

connection is loose or error, the prompt "F1 continues" willcause the system self checking to stop. If we do not want toconfigure or not use the floppy disk, just press the "F1" key,the system will continue to start, complete the system loadprocess.

9, when the CMOS battery is out of power, the configurationinformation is lost or the CMOS data is set incorrectly. Whenthe computer checks itself, there will be "CMOS checksumerrors", and the word "F1 continues" will be prompted. Suchproblems are generally not fatal faults, as long as the press"F1" button, the computer can continue to start, and completethe system load process. But for ordinary computer users, thecomputer does not normally enter the desktop after the powersupply, but stopped, it will mistakenly think that the computeris broken.

Solutions:

1) and for the CMOS battery is not, you can directly replacethe CMOS battery, and a+3V lithium battery motherboard can beused for about 3 years. Sometimes, CMOS information cannot besaved or lost, and it is not the CMOS battery that is out ofpower, but a problem with the associated circuitry.

2) if the CMOS battery voltage is not less than +2.8V, therewill still be checksum errors, so we need to press the "DEL"or"F2"button to enter the BIOS settings interface, the systemconfiguration is properly set.

10, when the system has completed all hardware device self-test,

it will list the hardware configuration list and resourceallocation list on the screen. As long as the system cancomplete the self-test, it has been shown that most parts ofthe computer are not fatal fault, and the performance isbasically normal. If the next system still fails to start, theproblem should appear in software.

11, other abnormal circumstances caused by the system can notstart properly

1) because of the internal switching power supply, filtercapacitor leakage or loss leads to unstable power supply, theDC output voltage is high or low, such as low+12V prone to harddisk, the system cannot find hard disk or CD-ROM out of the boxis not easy. If the machine can start normally, a large areaof hard disk appears easily in use process, to read and writedata error or loss. If the +5V voltage is abnormal, it is easyto appear, the drive can not pass the self-test, the system cannot find the hard disk and other failures.

2) , the CPU and the cooling fan is bad, or between the CPU andthe cooling fan of a foreign body, it may be because the coolingfan without power or dust too much, although the host can occurafter boot boot power on self test, but always have abnormalaudible alarm; sometimes also can normally enter the desktopoperating system; sometimes crash during startup.

3) CPU cooling fan in the speed check pin broken, resulting inthe system can not detect the fan speed, but can not boot.The fault shows that after the power on for a period of time,

the system suddenly power failure, in fact, this is the systemfound in the self-test CPU fan speed is zero, in order to avoiddamage caused by CPU forced system power failure protectionmeasures. But often because of the sudden power failure duringthe self-test process, sometimes the screen of the monitor hasnot appeared, which causes trouble and is not easy to detect.It is not easy to detect the fault location. Four, the host hasbeen powered up and can pass the self-test, but can not enterthe normal WINDOWS desktop operation

1, network startup

2, floppy disk or CD-ROM placed in the CD-ROM, there is a bootdisk

Most customers call to repair their computer, can not enter thedesktop, and full screen is in English when the mother,I didn't check that the startup sequence of the computer waschanged or that there was a boot disk in my drive, and therewas a floppy disk in the floppy drive. When the computer selfcheck completes, check the DMI data and update the ESCD data,then start the associated drive according to the startupsequence set in CMOS and complete the startup process of thesystem.

Under normal circumstances, the PCI slot card inserted, suchas network card, SCSI card and other boot priority in the harddisk, CD-ROM, floppy disk drive, etc. . When we install the cardwhen the card is not inserted, even if we start at Rom, we havenot set (SHIFT+F10) shielding card when starting the computer

in the ESCD update, the card will begin to start the computer,then soft light.

3, hard disk master boot no set active partition boot programor by the virus to rewrite the active partition boot sectorvirus rewrite boot file lost, will cause the system to completethe process of the hard disk from the start.

Especially in theWIN98 eraof hard disk logic lock virus, whenour hard disk is locked, when the computer starts to read thehard disk MBR information, the system will not respond for along time, only the cursor is blinking.

However, if it is a new hard disk, and when the system is notinstalled, the following prompt will appear.

4 、 WINDOWS98 startup process introduction and fault analysis

1) the system reads the MBR sector contents of the hard disk,and analyzes the execution code, booting the system accordingto the settings of theactiveprimary partition inthepartitiont ab l e.

2) next, the system reads the contents of the boot sector ofthe current active primary partition, analyzes the partitionparameters table of the current disk, and reads and writes thepartition based on the disk parameter table. If we mistakenlyuse GHOST to restore the hard disk or virus, or artificiallyblock the boot area of the hard disk, then we start the computeragain, and the following prompt message will appear.

3) , according to the boot sector of the set, look for the IO.SYSfile in the root directory of the C drive, and it is loaded intomemory, transfer control system. If the IO.SYS file is lost,the following prompt message appears.

4) the system then looks for the MSDOS.SYS file and determinesthe boot mode of the system in which the configuration isconfigured. However, if the MSDOS file is lost or corrupted,the system will still be able to access the DOS characterinterface normally but simply cannot enter the graphicalinterface.

When we miss because the system cannot delete the IO.SYS fileor other reasons to start, need to use the SYS command filetransfer system, we must first put the MSDOS.SYS file backup,and then transfer the system files. System file transfer afterthe backup MSDOS.SYS file recovery, this is because the CD-ROMand floppy disk in the MSDOS.SYS file is empty, which requireno configuration information, so the direct use of thetransmitted MSDOS.SYS file does not start to the graphicalinterface.

5) if the boot mode 1 is set in BOOTMENU, the system starts theWINDOWS image interface system. If set to other startup methods,start the computer in the relevant configuration.

6)when the computer starts the computer by"Normal", the systemwill load the registry SYSTEM.DAT and the USER.DAT file first,and then load the corresponding program according to theconfiguration information of the relevant system in theregistry. If the registry SYSTEM.DAT system configuration file