Computer stopped after 2 hours only
I bought a computer system that was running fine, yesterday. All I did was add to it my old hdd and dvd-burner. It was running fine, for a couple of hours and then suddenly turned off (it didn't shutdown). It will not turn on usually, it just flashes, occasionally it turns on for a very short amount of time like 30seconds or 1 minute. When the power is switched on at the back and the power cord is in the motherboard lights are on.
This same problem happened about 1 week ago to my last computer (ran stable for 5 years), this is why I bought the new system.
Any advice would be appreciated to fix this.
If this makes a difference, here are the components of my system:
p4 820 d 2.8ghz
asus p5wd2 premium mb
2 x 512mb 533mhz kingston ram
120gb seagate sata hdd
160 seagate ide drive (added, since has been removed)
pioneer 110 dvd-rw
pioneer 108 dvd-rw (added, since has been removed)
ninja cooling system
asus pci express video card 128mb ax 600xt/td
case antec plusview1000amg
ultra xconnect power supply 500W
logitec wireless keyboard and mouse