HELP PLEASE

m7719

Honorable
May 15, 2012
4
0
10,510
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.