I shut down my computer one night after just talking to friends on aim and printing things out for school, (its running completely fine nothing different than every other day). I come home from school and go to turn on my computer and it wont turn on. When i go to turn it on it turns on for just a second. The light flickers on and the fan starts to spin but only for a split second. I unplugged everything except the motherboard and tried to turn it on and the same thing still happens. Any ideas what could be wrong. (im thinking it may be the motherboard? or even the processor?) Im now on a different computer trying to get help for this problem. any help would be greatly apprieciated. HELP PLEAZZZZZ!!!!!

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used laptop computers

You could have a boot sector virus, but this seems to turn off abit too quick for a boot sector.
You proberly got a virus from a site or pop-up you clicked on.
I'd suggest using killdisc and if that doesnt work then I can only say wipe the computer of everything cause either way your not getting any files back. sorry.