My toshiba p845t had the same problem. No matter how I try, still no lock, and the bad thing is that CMOS button battery hid under inside, I open the bottom cover, but I don't want to take the whole motherboard out, it's too troublesome, so I cannot reset CMOS the button battery. I knew it's the BIOS problem, after I drained out power, sometimes I can get the screen back, but after shut down or restart, it went back to blank screen. Here is what I do to fix mine by flashing BIOS:

Toshiba Satellite P845t-s4310 Screen Cracked

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