Toshiba Satelite A100 Death

Hi, i have a Toshiba Satelite A100 Laptop, 2 years old and it was running fine, i had it in the Shop for some Software problem and picked it up yesterday, i had a Test run in the Shop and it was fine, then i went home and installed the Software for my new Olympus Though 8000 Digicam, played around with it for a while and switched it off.
i come back and found that it would not power up, only the Powerbutton would light up green but nothing else happens. Any clues anybody?
Thanks

Unplug it and pull the battery out leave it for a few min. Leave battery out and try ac power only.

Is there any diff on battery only?

Unplug all USBs. That helps sometimes.