Troubleshooting - PSU or Mobo?

I am having some difficulties with my homebuilt PC. It's a Q6600/P55 setup that was built a couple of years ago. I upgraded from a P45 mobo to a P55 mobo about 6 moinths ago.

I am running Windows 7 and I noticed a couple of days ago that the system was running incredibly slow. I checked for running processes and there was nothing consuming CPU. Then Windows Explorer would hang.

Soon after, Windows would intermittently hang at the "Starting Windows" screen.

Here were my troubleshooting steps

1) Checked for spyware/viruses/malware
Booted to safe mode. Performance issues happened in safe mode as well
Ran AV, hijackthis, and malware scans. All clean.

2) Suspected hard drive failure so I checked that
Ran chkdisk. Totally clean.
Installed fresh version of Windows on a new hard drive. Same issues appeared!

I am currently running Memtest86 and all of the RAM seems to be fine. That leaves us with the PSU, Mobo, or CPU as the culprit.

I am going to bench my PSU today at a store, but can anyone share some advice on how to troubleshoot the rest of the system? I need to isolate the problem fast so I can order parts. I use this PC for work.

Thanks.
3 answers Last reply
More about troubleshooting mobo
  1. You can't have a Q6600 on a P55 chipset motherboard. Please list your current hardware (CPU, motherboard, memory, etc.)
  2. Sorry, I meant P45. I had a P35 board prior.

    Specs

    Intel Core 2 Quad Q6600
    Gigabyte GA-EP45-UD3R Motherboard
    Antec 650W PSU
    8GB Gskill DDR2 1066
    EVGA GTX 260 Superclocked Edition
    Windows 7 Pro 64-Bit
  3. Check the CPU speed at idle (should be 1600 MHz). Then check it again while running Prime 95. This time it should run at 2400 MHz.
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