Self-test fails to find a hard drive failure at startup

The author has two hard drives, the old one is the IBM hard drive, the new is the hard drive. One day I turned on the computer, found that the system self-test can not pass, and heard the case inside the "Pa" sound, and hard drive lights are more than bright. Re-enable floppy boot to discover that the hard drive is no longer recognized.

Because the first two days just a new one of the hard drive, so suspect that this is a problem with the hard disk, so restart the BIOS into view, found that two hard drives have not been identified, a number of consecutive tests can finally be correctly identified. After saving the information to exit the reboot, this self-test does not have a problem, but into the system desktop, again appear "snapped" sound, hard drive lights flash. Although you can occasionally enter the system, you will lose the response when you open the Resource manager. Remove the newly installed hard drive, only the old IBM hard drive, the failure disappeared.

Originally thought the problem was found, but the next day the boot failure to appear again, suddenly realized that there may be a hard drive power cord or data cable out of the problem. Pull down the data line, and then inserted in prison, "snapped" the sound completely disappeared into the system, file read and write operations all normal. It seems to be in the installation of hard drive, pull the hard drive cable caused by hard drive data cable plugs and hard disk data slot contact, resulting in self-test when the head can not find hard drive area, and frequent positioning issued "PA" sound.

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