TLDR version at the bottom. So my computer was working completely fine yesterday... Until I got back from school today and turned it on to find out that, there's a problem. What basically happens, is that I turn the computer on, and it starts working fine, I get to the login screen, I choose to log on, or not, and it seems to be working fine. But what suddenly happens is that the monitor quickly fades to black and "goes to sleep" as if it is not receiving any signal from the computer. Then, the computer (which makes a noticeable amount of noise), stays on but becomes much quieter. It is still on, and you can hear that it is on, but it almost sounds as if it's not on because it's so quiet, like all the parts stopped working. So that's my problem, a computer that stops sending signals to the monitor and then possibly stops 'working'... I'm not sure what's going on myself. A very similar thing happened two years ago, where my graphics card would randomly stop working and the screen blacked out (I had to replace the card). However, I don't remember the computer back then becoming as quiet as mine after the screen blacking out. So im worried it might be more than just a graphics card issue. I haven't done some of the troubleshooting stuff, such as trying VGA instead of DVI-D, both from the motherboard and the Graphics card. I also need to clean out dust in the system, and disconnect some of the cables taking power. But still, I am posting because I want to know what you guys think could be the problem. I certainly don't want to shell out more money for another graphics card. If this matters to you guys, the computer is from 2007. TL;DR: my computer/monitor keeps blacking out. Help. Thank you.