|A computer is like a vacuum. It's constantly sucking in air to be used for cooling. But at the same time, it's also sucking in dust, fur, hair, etc that can accumulate inside. I usually clean my case about every month or 2. |
"I haven't opened it because I'm not sure how!"
It's pretty simple. All you need to do is remove the left side panel (when facing the front of the case). Make sure the PC is off & unplugged. There should be 2 screws in the back that need to be removed, then the panel will slide off. Go to the following link & scroll down about 1/4 of the way...you'll see how it's done.
BTW, do NOT use a vacuum inside the case. The static charge that builds up in the hose can damage the electronics. Instead, use compressed air to blow the dust out.