Hello! Last week I had a problem with my graphics card that "burned". I got my Mac back a couple of days ago and yesterday I decided to clean it up on the inside, something I've never done in 6 years. I just used a clean cloth, a brush and a can of air. I tried to be as careful as possible. When everything was set and done I booted the Mac and everything ws fine and dandy. A few hours later, I booted the Mac again and it froze when booting in Windows 7 (Bootcamp). I restarted and the same problem appeared. I then booted in OSX and turned on Wi-Fi (I use a direct cable for internet) and the OSX froze too. I then booted Windows 7 in Safe Mode, disabled the wireless card and so far it's been working. How can I fix this? What could I have done wrong? I don't really use wireless in my MacPro, but I don't want freezings anymore. Was this my problem because of the cleaning? Was it possible that this was caused with the swapping of the graphics card? Weird stuff... Thank you! P.S. - I used Lorenz Bell Spray Duster. Personally I think it sucks because it doesn't seem to have a lot of "power", plus it created some wet zones, so I just tried to used it on the fans.