Offhand, your HD doesn't sound like the problem, but 55c sounds hot for the processor (mine at full load never runs more than 42c). Did you remove the heatsink when you switched the cpu cooler or just the fan? Perhaps you have bad thermal contact. If you only switched the fans, did you plug the fan into the motherboard or hook it to the fan controller? I've found that coolermaster fans pull more power than can be supplied by the motherboard. If not, perhaps your cpu fan can't pull enough air over the cpu heatsink.
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Charlie was a chemist but Charlie is nomore, what Charlie thought was H2O was H2SO4
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