Computer won't start up

hi
I built a new computer with the help of my brother last september.Tonite I decided to move it up to my room,when I had everything in my room I plugged everything in and it would'nt start up,there no lights or noise out of it,any ideas what could be wrong?and it was working fine all today I just dont understand what is wrong.

any help and advice is appreciated.

thank you.
 
computer won't start

Have you checked the fans? power supply, processor etc, are they turning?

a very useful tool to have is a power supply tester, you can get them pretty cheap, just plug it into to the power supply and it lights up and beeps if the power supply is ok.
 
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