Ok, so the computer has been acting up. Runs fine then just goes off. I took the sides off the other day and blew out all the junk, some hiding where I've never been before. Hoped that would fix it. Ran ok for 2-3 days then just went off again. It fires right back up but I have no idea what might be causing this. Don't want to replace the whole thing right now as it is fine for my needs and I have too much else in the air right now. It was custom done for me a few years back ( I know, I know it's old and needs replacing) but I have very little computer insides knowledge. I do have other computers but want to keep this one going a bit longer if possible. Any ideas? Thanks