Changed case and CPU for old PC, now randomly shutting down/restarting


I built a new PC a while ago, but wanted to use my existing case, I had a really old ugly gray case lying around but its ATX compatible so I said Id use it.

old PC spec is

Intel Core 2 Duo 2.13ghz (E6400)
2gb Ram
Radeon 5670 1gb DDR5

I took all the old components out of my existing case that I wanted to use on my new rig, and put them in the old gray one. Around the same time a friend gave me a Core 2 Duo 2.66ghz (E6700) he had lying around, so I took out the old CPU and gave it away, then replaced it with the newer one.

My old rig boots in the old gray case, but it randomly shuts down or restarts, it could be on for as little as 2 minutes or as long as 90 minutes (the longest its gone) but it always happened. I thought the power supply was on the way out, so I replaced the old PSU which was a Hiper Type R 580W with Tagan 430W. The only noticeable improvement now is that with the Hiper PSU it sometimes didn't power up at all, or after shutting down would not power up unless left for a few minutes, with the Tagan supply this happens a lot less and stays on for noticeably longer, but will eventually shut down/restart.

Any idea what might be causing this ?, other then the E6700 all those components worked perfectly in my original case, all I did with the E6700 was wipe off the old thermal paste and put on some new stuff (MX - 2 with pea method). Really want to use this old rig as a media server :-(

Thanks in advance
4 answers Last reply Best Answer
More about changed case cpu randomly shutting restarting
  1. Here is a link to what your board accepts did you update the bios be sure heatsink is seated good make sure fan is plug into the fan port named system cpu.
  2. Thanks.

    "E6700, 2.66 GHz, 2x2MB, 1066 MHz, LGA775 , Bios 07/08/30 V1.0"

    Says it supports it :(, looks like its the fastest dual core it can support.
  3. Best answer
    The chip could be bad or both of the power supply units are bad try running with 1 stick of ram be sure you have everything plug in as well.
  4. Sorry to bump an uber old thread, got married since then and spare time is at a premium, but just watched this video

    This guy tried replacing all his components, even had his Motherboard replaced and still had the same issue, turned out it was the off or reset switch on the case in the end. I haven't tried this but the case is super old (like 2003 ugly grey tower old), could this be a factor ?.

    Im gonna try taking out 1 stick of ram and some other components to see if I can narrow it down.
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