System locking up

I built a machine a year ago for a friend and it has worked perfectly up until recently.

All of a sudden whilst using MSN Live Messenger and Internet Explorer the whole computer would lock up and require a forced reboot.

I fitted a new hard drive and did a clean install of Windows Vista. The problem still occurred!

I removed the wireless network card and bought a new USB dongle and to my surprise the problem is still happening!

Could it be the motherboard / memory? Any ideas welcomed as it is driving me insane!
7 answers Last reply
More about system locking
  1. My first thought would be RAM. Have you run memtest86+ for a few hours to test for RAM errors?
  2. I've just downloaded memtest86+ and will give it a run through tonight.

    Any other ideas on how I can find the problem?
  3. I would start off with memtest86+. What are the complete system specs? Unstable voltages from a dying PSU can also cause system freezes, but I would focus on the RAM first. If the system runs multiple passes of memtest86+ with no errors then we can go from there.
  4. OK thanks. Will post a response to the memory tests tomorrow.
  5. Sounds good. Good luck!
  6. I have run about 8 memory tests through with no errors whatsoever.

    Any other ideas?
  7. Just trying to bump this thread up a bit.

    Cheers
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