6 Oct 12
i think your problem is with your video card. i'm just guessing. video games tends to require a lot of memory and space, so maybe your card gave out. i had a problem like that in my laptop. it had 512mb of dedicated video memory. but it turned just like yours, just because i was playing games that are too visual. technical people i approached had a common theory, that is, the problem is with the video card. the authorized service center also said the same thing.
10 Oct 12
You should probably check for loose ends somewhere in the cable to the monitor and it's that is not the case then maybe you have some problem with your RAM. I have heard that when the RAM fries, the display goes away. So you might have to change that or any other part is causing. Usually when the RAM fries the CPU will sound when it's running but if it's your SMPS then you CPU won't even start, because that is what supplies power to your CPU. So you have need to have someone experienced check you computer.
7 Oct 12
If you never changed anything on your computer before, then it's more likely about hardware fault. It can be RAM, VGA, or else. If you don't really know about computer components, it always a better idea to consult someone who better at it, such as computer service guy..