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I have an old Asus P7H55-M Pro motherboard: and recently I bought a new 600W power supply (Coolmaster brand) but after I put all pieces together and turned on the power, the front panel blue light turned on but then quickly turned off and if I press the power button again, nothing happens unless I plug the computer out of the power source and plug it back in and then everything repeats.

I am just wondering what is the likely cause of the problem so that I can troubleshoot accordingly? Thanks!

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Err, try the old power supply and see if that works. Also, does the light just blink once or what? – cutrightjm Sep 26 '12 at 4:10
What pieces do you have connected? You should test with just the motherboard, CPU, RAM, and power supply. – David Schwartz Sep 26 '12 at 6:03
@ekaj: the old power supply is broken and short-circuited the moment it was plugged in (even without PC powered on), that's what I changed the power supply. – zhuanyi Sep 26 '12 at 11:48
@DavidSchwartz Good point, I connected to too many pieces, I will give it a shot again today. thanks! – zhuanyi Sep 26 '12 at 11:48

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