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Based on what you say, I vote power supply. Five years of a spinning fan, and the accompanying dust, are immediately suspect. The wattage isn't the first red flag -- the age of the part is, in this case. However, I wouldn't go lower than a 450 wattage PS to replace. Go higher is possible.
Also -- reinstall the OS with the fewest number of peripherals as possible, and then add them one by one after the install of the OS.
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less I say, smarter I am
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