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My computer would not restart after just being shut down. I did a little research and determined it was most likely the power supply or possibly the motherboard. I have a HP Media Center PC and HP's website indicated that for standard PC's, HP uses ATX power supplies which are available at local retail stores like Best Buy. The power supply is the first place to start and for the cost of about $50 it was well worth it. The replacement power supply was 400 watts while the original was 300 watts...that's ok. The power supply case dimensions matched my original. The power supply connectors matched my original...that's all I needed to make the purchase. After about ten minutes my computer was back up and running!
What's great about it: Direct replacement, each cable group is encapsulated in a protective sheath