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The hard disk activity LED flickers every few seconds even when nothing is running on the PC and it is completely idle
Explanation: The activity LED on the system case flickers every few seconds, even when nothing is going on with the PC.
Diagnosis: There are a couple of possible explanations for this behavior. First is Windows 95's "auto-insert notification". The feature that automatically loads software from CD-ROM drives works by constantly checking to see if there is a CD-ROM disk in the drive. This causes the activity light to flicker on some systems. Another possibility is that there is system work occurring that you may not be aware of. Windows does do some housekeeping work at occasionally odd times, and there can also be background tasks that run from time to time.