First time posting on macrumors. I have a technical issue that I'd like to get some help with: TL;DR: My computer freezes completely when I do more than a few basic tasks, and won't boot properly before several reboots. Panic report seems to indicate that it might be a CPU problem. System Info: Macbook Pro, 15" ultimo 2011 (late 2011) Software: Mac OS X Lion 10.7.5 -- Processor: 2.2GHz Core i7 (2675QM) Memory: 8 GB 1333 MHz DDR3 (Upgraded from 4 GB) Video cards: -Radeon HD 6750M - 512 MB GDDR5 SDRAM -Intel HD Graphics 3000 - 384 MB DDR3 SDRAM Hard drive: 500 GB (5400 RPM), Serial ATA (6 Gb/s) -- The machine was bought new in 2011. -This makes me quite certain that my warranty has expired by now. Problem: The problem started approximately one week ago and has been there consistently ever since: 1: It does not boot properly: When I start up the machine, I hear the startup chime, see the apple logo, and the machine loads as it usually does. However, when the apple logo disappears, the screen becomes white and stays this way until I manually turn it off by holding down the power button. Sometimes it turns itself off after about 5 minutes. -Sometimes the system boots properly, and I'm able to use my computer as usually (which is how I'm writing this post in the first place). 2: After some time, the machine spontaneously freezes, and I have to turn it off manually, because I'm completely unable to interact with it. Most often, it shows either a row of blue and black vertical lines across the screen, or black and white ones. Sometimes the screen simply freezes without any optical glitches. -I've noticed that the tendency of freezing is highest when opening and using decently heavy programs or generally using the computer for more than a few basic tasks. (Examples: Browsing with Google chrome, playing music with Spotify, etc.) For about 3 of the many times these problems have occurred during the last week, the machine asked me to manually restart the computer. Afterwards it opened with a Panic/Problem report, of which one of them can be found here via this pastebin link: http://pastebin.com/Ph1cz5wh -The report seems to indicate that it might be a CPU problem, as far as I can tell. What I've tried: I followed some of the support articles on support.apple.com and tried these solutions: Booting in safe mode. (Shift key at start-up). -This did not solve the issue. Running AHT at start.up (Apple Hardware test) (D key at start-up) -I ran the basic test, which stated that no trouble was found Booting in single-user mode and verbose mode (Cmd + S and Cmd + V respectively) -None of these solved the issue -I did not change any files in single-user mode. I also booted in Recovery mode (Cmd + R) and completely reinstalled Lion. This did not help either. Potential causes: -During summer I had my computer lying on the bed. It sled off onto the floor, which I suppose might have caused some internal damage. However, this happened quite a few weeks before the issue began, as far as I can recall. -I read online that the fans might have collected dust over time, which can make the CPU shut down itself to prevent damage from overheating. -I also recall reading about a gel inside the computer that there could be something wrong with. Any help at all is greatly appreciated.