PC turns on but suddenly turns off

[slinger45]

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......

 

[soundguruman]

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.