I have a Macbook Pro, late 2011. It just happen to screw up suddenly.
I just had NetBeans with Tomcat running, as I'm a programmer, Google Chrome and Windows Media Player. I run the PC in Windows 8 Bootcamp, because I really dislike OS X, even tho, I have a Yosemite partition.
The thing is, I was listening to music, while coding, and suddenly my screen turned black with vertical and huge red stripes, then in a matter of seconds, it switched to a gray screen with tiny horizontal red striped all over.
I restarted the PC manually, holding the power button, and Windows was trying to load (With the huge vertical red stripes) and when completed, I get an Windows error message, that I couldn't load.
After several attempts, it gets to the home screen and then, it suddenly fails again. I tried to run into Yosmite, but as soon as I enter the password, the screen turns gray with red horizontal stripes.
I suppose it's the GPU, but meh, I brought this piece of brick 2 months ago, and now it's just garbage, so not fair. My HP Pavilion lasted longer.