I've got a Tobisha Laptop, and sometimes it gives me a yellow triangle with an ! in it which says something about memory and that I should restart my programs. I do this, but then the screen flickers black and doesn't respond, sometimes for a few seconds, sometimes for a few minutes, but it always comes back. Sometimes I have to use the ON/OFF button to get it to work again. There's also a plain black screen when I switch between mom's desktop and mine. I'm scared that someday the normal screen WON'T come back. How do I fix it so mom doesn't know there's a problem in the first place? I've never had a Tobisha computer before and am unfamiliar with Windows 8.