Satellite Pro L850 won't boot F2, F12, C & 0 do not work

My Satellite L850 race that Win7 does not start, after that power on it alternates between dark grey and light screen.

I tried holding C and 0 when blood work or fact by pressing F2 or F12. No new software has been added recently. Please, any help appreciated, thanks.

After reading your ad, it is not easy to say what the problem is here. He started from one moment to the other, or you did something that may be responsible for this?

Are you sure display is not faulty?
If possible try to connect your laptop to external monitor and start again to see if something pops up on this subject.
Disconnect the power and remove the battery. Press the power button / stop for 20 seconds and leave it for a while. Only connect the power supply and try to start it again. Test it with external display.

Maybe the BIOS is screwed up. Perhaps is troublemaker GPU. On this virtual path, we can only speculate what may be the problem.

By the way: when you turn on your laptop doesn't it stay ON all the time?

Tags: Toshiba

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