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First determine if the laptop will work with an external monitor plugged into it. Plug it in and restart the laptop. If it does not have an image, you may have a failed video card or bad motherboard.
Remove battery and ac adaptor. press power button and hold for 30 seconds. Reconnect AC power only, try rebooting. If this fails, then you have a problem with the power switch, or the cut off switch which is located just by the screen hinge may be sticking.
Failing that, and assuming the DC jack is a tight fit, you could have a problem with the motherboard. In this case, I would advise you get it checked by a professional
You can try removing the battery and unplugging the laptop in order to try to perform a "power drain" on it. To perform a "power drain" after you have removed the battery and unplugged the power cord, press and hold the power button down for about 30 seconds.
Once you have done this, attach the battery and power cord and see if it will power-up.
If it does not power-up, then the laptop has failed and you should take it back for a refund or replacement.
Pull out the battery and the power plug. Then plug back in the power plug. Attempt to start your laptop. If it starts then the battery is the issue. If not the hardware has failed and you need to contact Toshiba for warranty support or a local tech if it is outside of warranty. -Ravi Shanghavi
A bios update should not cause the laptop to fail in powering up. Regardless, whether you used the correct bios update or not, the laptop should still power on. You may not be able to boot to windows, but you should still power up.
You are have hardware failure unrelated to bios change.
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