Hi. I recently noticed that whenever i played a game my computer would start making a single beep[ every ten seconds or so. I opened up the box to check if the fan of the gpu was clogged and sure enough there was lots of dust that i had to clear out. I put the thing back in the computer and made sure that the fan was going and everything was put back together in the right place. However now when i play half life 2 ep 1 i get a poor fps. I have all the same settings on as i used to. My gpu has an aftermarket coller. I think its one of the arctic freezer ones but forgotten now. What could be the problem? Is it likely to be an overheating issue?