Every time I attempt to turn on my computer, it doesn't start. It shows a black screen (much like a command-line based computer; black screen with a blinking line to type). It gets to the black screen, and everything freezes, and I see 4 small square-like figures at the top of the screen. What does this mean?
I should note that I recently opened up the computer with a magnetic screwdriver. Could this be the cause of the problem?
It is a Toshiba Satellite C655-S5082
Thanks in advance for any help.