My pc won't turn on. Please help!

My pc has worked for years. But two days ago it stopped turning on. When I click the power button the fans run for a split second and shut off. I took out the mother board and placed it on cardboard, to check if the case is shorting it out but that didn't work, I took off everything except the ram, CPU and CPU fan. It still just starts up for a split second. I cleared the cmos. I reset the ram and tried one at a time. I also reseated the CPU. I tried a different psu bad the same happens, please help!
5 answers Last reply Best Answer
More about turn
  1. Do the paperclip test on the PSU:
  2. I tried this and the Psu did spin
  3. The entire time?
  4. Yes, it didn't stop spinning until I turned it off
  5. Best answer
    Try to remove your memorys, and turn on your pc without memorys, if you hear long beeps your motherboard is ok, if not you need new motherboard....
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