Windows 7 Freezes, have to hard reset, then wait 10 min until I can boot back up

System locks up, needs time before it can be restarted

I have a newly built computer that locks up usually 10 to 15 min after booting usually I am browsing the internet then pages won't load then my browser freezes and I can't Ctrl apt Del. Then everything freezes and I have to hard reset but the computer won't boot up unless I let it rest for 10min

Everything in the computer is brand new
I have it running the bare minimum
1 stick of memory
The hard drive

I noticed in the bios that the 5v and 12v are low
The 5v is running around. 4.2
The 12v is around 10 .4

I've spent 2 days trying different things, any help would be greatly appreciated

I have tested the CPU and even re installed it
I have tested the memory it seems fine
I have checked the wires
I have reset the bios


Its a new ultra 550 watt PSU a new asus m5a78l-m lx plus mb
An amd HD phenom ll x6 processor a wd blue 500gb hard drive
2 hyperx red 4gb ddr3 memory modules a radeon hd 4350 GPU
Running win 7