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Best way to stress test a PC for HW probs?

Problems now solved (booted to a blinking cursor)........

New hard drive and new opsys new graphics card.

I suspect a possible mobo anomoly - intermittent.

Alll Dell tests passed.

Whats a good way to stess test a PC? Dell Optiplex  780

4 Solutions
I'd pull and exchange the RAM, it's not unlikely to be a stick of RAM causing the issues.

I'd download UBCD and run the memtest+ for several hours.

There's lots of stress testers, but I'd worry about the ram the most, it can corrupt in different ways and cause issues that look like other things.

Prime 95 http://files.extremeoverclocking.com/file.php?f=103 and http://www.mersenne.org/freesoft/

If you use Prime95 also check temperatures while running.  Use Speedfan http://www.almico.com/speedfan.php for example to do so.
OpenSourceMark is also worth a look:
nobusbiljart fanCommented:
this exercises all devices    http://www.passmark.com/download/index.htm            Burnin test
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