I flounder for weeks on a thorny problem. Thank you to all who could help me.
Toshiba Satellite P200-100 Model PSPBOE
OS: Vista, but it did not matter.
In an update proposed by Toshiba, flashing the BIOS stopped midway and the computer will not boot: the BIOS does not play and the computer stays off and silent.
The service gives the address of the repairer, it will not talk about technique and asked 120 euros entrance without performance guarantee. I'm not saying they do not have good reasons.