Analysis of the cause of malfunction in computer startup

Resolves the failure to start the black screen, and the other failures in startup are described below. Compared with the black screen fault, because the display is not a piece of black, sometimes the screen will also appear error, so as long as you can understand the following typical failures, processing is much easier.

1.Reset key corruption cannot be started

A computer on the boot for a period of time after the black screen freezes. The same phenomenon occurs after a period of re-booting. After several reboots, the machine is not self-checking after booting.

began to think that the hard disk or card is not plugged in, open the chassis to re-insert the hard disk and video card and other things, again boot still no response; Then suspected power problems, after inspection, power supply in the work, and then use a multimeter to measure the power output voltage, all normal, judging by the motherboard is a problem.

After checking the motherboard there is no obvious scorch marks on the loose. Then unplug everything you can pull out of the motherboard (CPU, memory, power Plug and video card can not unplug) post through, to prove that the motherboard is not a problem. Finally restore, finally found out the reason: The original is the chassis "Reset" key is broken, in the press down after not bouncing back, has been in a short-circuit state, no wonder the machine can not start.

2. Two-in-a sound card causes startup failure

A multimedia computer, there is a Lenovo Sound Blaster two-in-one card, the original work has been normal. But recently turned on the machine self-test abnormal, always no regular self-test can not pass, and then the crash, the average switch machine five or six times after the success of the process, the operation of all normal.

Human surface analysis, it seems to be a graphics card problem, after the replacement of the fault remains. Then carefully observe the sound when the power-on, found that after the hard drive after reading 0 tracks no movement, normal operation, with Windows disk scan hard drive all normal, no bad road, the hard drive can cause the possibility of failure to exclude.

The problem is focused on the two-in-one card, this two-in-one card in the process of occasionally starting a successful work all normal, after the maintenance staff explained, may be two card of a section of the circuit because of the power on the power of the impact caused by the short-circuit, so the above fault, after the switch on all normal.

3.DOS interpreter error causing hard drive boot failure

Boot computer, hard disk DOS boot failed, ScreenTip: Bad or MISSING command interpreter (commands interpreter error or missing).

This failure indicates that the DOS system command interpreter Command.com error or is missing.

The command file could be faulted because the file information was corrupted, and the hard disk sector where the file was stored failed to read the file.

The command file is missing because the file was mistakenly deleted by the user, and the user replaced the command file in the same version of DOS when the file was copied.

Whatever the cause, simply boot the system from the floppy drive with the same DOS system disk as the version on your hard disk, and copy the command file on the floppy disk to your hard disk. If the system cannot be booted from the hard drive, the SYS command can be used to transfer the entire system.