I have been using my new computer for about a month now. It runs trainz 2010 pretty good. I have a cat in my house and dust gathers up pretty quickly. About every week, I just dust the exterior of my system case and my work station where my monitor and keyboard are. Now, it has been a month since I looked inside the case. Earlier this morning, I opened up one of the doors so I can see the inside of my case and the power supply, graphics card, and some empty spaces have gathered some dust. I would like to know, if anyone with a desktop computer ever really goes inside the case to clean it out. I am a bit afraid of actually going in there to clean out the dust because I do not want to break anything. Does anyone clean the inside of their computer or would it be best to just leave it along. For now, I just dust off the exterior of my system case almost every night.