Toshiba
It wont do anything now, eh?
Have you dropped it recently, or done anything that might jar things, maybe kids playing with laptop? (no offense intended)
Any weird noises or smells from the laptop? Do you ever get a static shock from the laptop?
Before this all started did you see
any error messages, a BSOD, a slow loading of OS or programs, slow POST'ing?
Have you had problems charging the batteries?
Do you have antivirus software; if so what manufacturer? How often do you scan your computer? How many infections would you estimate are found on a monthly basis?
Though it may be a BIOS infection, I
highly doubt it. Most viruses today don't target BIOS. But knowing how often you scan and what you scan with will be good info.
I'm leaning toward a power supply problem. Have you plugged in anywhere that might be prone to spikes, surges, power outages?
When plugging in, you may want to consider checking the outlets for a problem. There is a little tool you can use to see if there are wiring problems at the socket. I use it before I plug in my laptop anyplace thats unfamiliar. Or take the chance of hearing
"POP!", and the laptop is toast. You can buy them at home supply centers.
Learn about wiring testers here:
http://www.acmehowto.com/howto/homemaintenance/electrical/outlettest.php