"b11_" wrote:

> When I press the keys Ctrl, or shift, or Tab during bootup, what is the
> consequence?


You go straight to jail. You cannot pass go, and you cannot collect £200.


Looking at a number of your posts, they are very vague.
It would help if you could tell us what opperating system you had. what
hardware you have got and a little bit more detail as to the problem. as in
what you were doing before the screen goes blank or does it happen every
time. ETC

Have a nice day.