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Computer will start normal. While in use, computer will randomly shut down. Upon restart message reads "non-system disk or disk error"
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Could be the hard drive going bad. Check the hard drive with the manufacturer's diagnostic tools.
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
Bootable Hard Drive Diagnostics

Next, test your memory. Download Memtest86+ (you want the 2nd one Download - Pre-Compiled Bootable ISO (.zip)). Unzip it then create a CD from the iso file using your CD burning software. There is a good freeware burner called ImgBurn which will do this easily.

DO NOT burn the .iso file directly to CD. It must be used as input to a program that knows what to do with it, like the one I mentioned above.

Boot the CD and run for at least 3 complete passes unless it shows errors sooner than that. An overnight run is even better.

You should also check for over heating with SpeedFan.
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