Computer locks up, I have to hard shut down then wait 10 min before I can reboot

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

 

What kind of cooler are you using with the new cpu, and have you checked the cpu temp? Have you watched the cpu fan come on and do you hear it running when the case is closed? Overheating can cause lockups.

 

Thanks for your reply, I replaced the PSU which seems to have solved the problem.

 

Great! Enjoy