CPU/Mobo PC won't start :(

bltallama

Disciple
My PC won't boot... no display ...but power led on motherboard is lighting ....PSU working .....cpu and gpu fan running the DVD drive works....but it just won't display or boot. What do I do ? please help. I tried running my mobo with a different PSU but the same thing happens. Also to mention my system simply starts without even touching the power button. I tried mobo CMOS reset ..no good . A different GPU ....no good. The mouse and keyboard power up fine though.
 
It didn't work either.... but an interesting thing happened I tried plugging in without any RAM at all (expected beeps) but nothing happened ...the usual fans started running and leds lit up but no beeps
 
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