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I have an old Asus P7H55-M Pro motherboard: http://www.asus.com/Motherboards/Intel_Socket_1156/P7H55M_PRO/ 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? –  ekaj 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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