freeze related to HW?

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Dec 13, 2009
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Your Mac's Specs
MacBook Air mid-2013 4GB, and other machines
2.1GHz intel, Core2 Duo, last of the white iMacs. Just got this from eBay.

Seems great...until after sleep, when it might run a few minutes and then inevitably freezes, necessitating holding the power button to shut down.

Googled a lot; seems no confirmed broad fix.

I was intending to change from Snow Leopard to Lion and install a bigger HDD. BUT before I do that, is there any non-tiny chance this is HW related? Because if it's hardware, forget it, I'll just return the machine.
 

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