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Computer won't start

Ok, So about a week ago I came home and my computer had shut itself off. The lights on the motherboard were still on. I would press the power button and nothing would happen. I turned off my power supply and all the lights went out, and then switched it back on. The lights on the motherboard came back on and when I press the main power button the case fan would twitch like a 16th of a rotation only the first time I pressed the button. The case fan is connected directly to the power supply. There was no other reaction. I replaced the power supply and nothing changed. The system is under a year old, ASRock P55Extream with an i5 processor. Any ideas?

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Comments
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(NT) Our Next Step Would Be To Replace The Case Power Button
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No luck

Disconnected my case button and used the power button on the board. no change

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How to temporary jumper the power supply
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Will try later

I got a new power supply and no luck. I will test the old one later as maybe it caused the problem.

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