PC switches off power to harddrive every 20 / 30 seconds. No warning, instant power-off. All data on PC lost. Have gone the "Control panel, Screensaver, Power Saving, Advanced" route - no success. Running XP-Pro, SP2 on pent. 4. Who has the answer????

Could it be a faulty molex plug (or whatever that is).

Either replace it with a spare, or swap it with the floppy drive or CD one.

If you don't know what I am talking about, take it to a repair shop

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