HP DM3 Instability

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This machine has been unstable since I got it, and it gradually got worse
to where it was unusable. Installing Windows 8 CP has mostly cured it, but
it still crashes more often than it should. I spoke to someone else with a
DM3 still running the original Windows 7 that has had no problems, so it
may be just this machine or a bad batch? It has passed every hardware test
I have run. In Win7 it gave hardware errors with some incomprehensible hex
code, but in Win 8 CP it now, less frequently, throws an 'ACEEvent' and
mentions ATI, which I think is the brand of graphics adapter - do I have a
bad graphics card?

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