I'm not sure what you mean by not matching... But if it started after the new power supply, that's probably your problem. I would assume you have a cheap power supply in there and it's probably not putting out decent amps. Or even new ones could be faulty...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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