Yesterday I was working on my PC for couple of hrs. After I was done, I switched it off and left for some work. When I came back and tried to switch it on.. it won't start.

No fans wotsoever.. no cpu fan, no chasis fan, no smps fan. I only see a small led lighting up on motherboard. That's it! Nothing else.

Same thing happened 6 months back.. that time processor came loose... I reinstalled it.. and it was fine. But this time, I tried almost everything.. nothing seems to be working.

1. I reinstalled RAM and Processor... no use
2. I took out all optional components.. all cards... drives.. ide... and left only motherboard, processor and RAM. Still its dead.

Is there anything else I can do to find out what the hell is wrong with it?

What I don't understand it is.. why won't smps fan start? Is it connected to motherboard.. even last time... when same thing happened... smps fan was down.. so might be connected to motherboard somehow.

Can I check my SMPS in someway using multimeter?

What else I can do?

My System Config: P4 3.2 GHz with HT, Intel 875BZ motherboard, Antec Sonata II Tower, Kingston 512 MB RAM