I have an Acer laptop which is about two years old. It started to run slowly and not very efficiently - then the screen started to go blank. Sometimes it goes blank when i am using it or when i am not. . I can see the computer is actually still processing so the whole computer does not shut down. I would be able to reboot and then the computer would be fine again. It started to do this more and more frequently until it was happening every couple of minutes and then my computer stopped booting up and loading software. I took my laptop to a recommended pc repair shot who reinstalled windows (unfortunately). It definitely was running much better and the screen stopped going blank. about 10 days later and the computer is running well still but the screen is starting to go blank again regularly - every 10-20 minutes! is this a virus/software/hardware??? thanks in advance for any help you are able to give me!