Mac Mini intermittently emulates a brick

I'm having intermittent problems with my Mac Mini which begin with it not recognizing new usb devices when I plug them in, followed by intermittently turning itself off for no apparent reason, and then followed by not turning back on (no chime, no light, no nothing).
I've had it in to the Apple Store at least twice for troubleshooting, but the problem is intermittently and sometimes goes away during the trip from home to the Apple Store. It isn't just being unplugged for a while and plugged back in; I've tried that with various periods of being unplugged up to a day in length and it never made any difference. I think it has something to do with being jostled as I move it, because today it came on after getting a hard smack on the bottom.
Any ideas? I have a service appointment for today and I plan to keep it, but last time the appointment was no use because they couldn't reproduce the problem. Intermittent problems are difficult to troubleshoot.

BTW - I think the main board has alrady been replaced once, and the symptoms sound to me more like a bad connector or cracked board that is either shorting or not making contact slowly as the temperature or humidity change, then comes back to working order when the tension on the board or contact is relieved.
That said, I can't keep hitting my mac when it doesn't work or I will break something.

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