Please help, i have just built my first PC and am having problems with the system shutting down and will not turn back on unless i power down at the mains for a few seconds. It has been random but every time i try to install flash player it always happens. i'm running: windows7 home prm 64bit asus m5a78l-m/us83 motherboard amd fx8120 3.1ghz EZcool 500w power supply.
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Since you have given no info basically. Im gonna say its the garbage power supply or its RAM. Other than that, who knows with what info you given.
do you have another psu? coz that ezcool is very poor and could well be the root of your problem.
I can concurr that I have seen those symptoms with PSU issues.