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Is there software that helps identify problems, issues, conflicts, etc. with the hardware of a Mac?

I came across Tech Tool Deluxe, which was apparently used in Applecare. Wondering if there was any other hardware diagnostics tool out there.

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Looks like Apple Hardware Test is a possible solution. Might need some elbow grease to get it to work on OS X Lion.

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I've got Apple Hardware Test running, but it finds no problems. Still the machine locks up a lot (with no logs left behind). Any other tools to recommend? –  Thilo Mar 15 '12 at 11:59
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