PC turns on but suddenly turns off

I bought a new motherboard and a ram...other....are...from my old....pc.....

When i turn on my PC it boots But..suddenly......after 30 secs turns off.....

Whats..the...problem???


All...of....these...are...compatible......
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More about turns suddenly turns
  1. The RAM needs to be matched units. Try one RAM at a time.
    BUT it can be a bad power supply or a defective board.
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