|Power down computer. Remove battery and ac adapter.|
Press power button a few times.
Put ac adapter back in and try. (I doubt it will work but worth a try)
Then you may have to consider taking it apart or have someone else do it. Might try an external mouse or keyboard just to be sure the OS works.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, Make an autorun.inf folder on all usb drives.