It totally sounds like your power supply was dying. Frankly it is one piece of equipment that people skimp too much on. While I may usually work on much bigger/nastier computers for industrial and embedded uses, a good power supply will extend the life of your system and will deal better with a crappy power feed from your local utility.
Also, you might even be able to find one that is quieter than your current one, unless of course you like the jet engine machine running underneath your desk.
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