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Why would a computer that has been working for month's suddenly start having a "Bios not fully ACPI compatible" blue screen error, when the bios has not changed?

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not a complete answer, but the situation you describe may be a sign of hardware failure. backup data now if possible. – quack quixote May 6 '10 at 6:02
@quack Thanks, I'm leaning towards it being some memory going bad. – C. Ross May 6 '10 at 10:18
@C.Ross: try running memtest86+ (via Ubuntu LiveCD if you need to get it) – quack quixote May 6 '10 at 10:25
@quack That's the plan. Explaining iso's and live cd's over the phone is no fun though. – C. Ross May 12 '10 at 13:40
@quack Want to make than an answer so I can accept it? – C. Ross Jun 11 '10 at 16:05

During testing with Windows memory tool, the problem occurred.

After contacting DELL support they gave permission to open the case and re-seat the memory, which was done.

This corrected the issue.

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