Hello guys, My Late 2011 Macbook Pro 17 inch seems to be having some problems the past day. I'll start at the beginning. I was just browsing the web on Chrome with about 3 or 4 tabs open and my display suddenly went black. I'm not sure if it turned off or just displayed black. The only other apps that were open were iStats Menu, Memory Clean and Finder. I tried holding the power button to turn it off and then tried turning it on again. There were these faint lines going vertically down the screen at the Apple logo boot screen. It brought up the little loading bar that seems to be there since I install Windows 8 and the Yosemite Beta a few weeks ago. Then the screen went a solid light grey and the Macbook started getting hotter and hotter in the middle. I recently upgraded from the original 8GB 1333MHz of RAM to 16GB 1600MHz of RAM. I also installed a 250GB Samsung 840 SSD last year. I tried replacing the RAM with some older modules totalling 4GB from my old 2009 Macbook Pro, but that didn't do the trick. I noticed that there was a lot of heat coming from the middle of the logic board. I cleaned the two fans and reinstalled the 16GB of RAM. I tried reinstalling the original 750GB HDD. It seemed to do the same as the SSD, only it managed to get to the login screen after the grey screen, but after logging in, it went back to the grey screen. I also tried booting into recovery mode, which would result in a grey screen and I tried going into the Apple Hardware Test mode, but no good. Same with safe mode. I don't really know what to try next. There doesn't seem to be any burned components on the top of the logic board and I haven't tried flipping it over yet since I've never attempted that before. Does anyone have and suggestions on what I could do, or am I screwed? The only Apple repair center near me is only an apple authorised place and has been really poor in the past. They've tried to con me out of money twice and I don't want to have to do business with them again. Here are those blue lines. Sorry about the abysmal picture quality. Thanks guys.