Client crashing?

SereneBelle - Dreamweaver

So the other day, I was in a Nirvana squad, (Sorry to everyone who was in it, by the way) And everything is going fine, then all of a sudden the game client freezes, my screen goes blue, and I have to turn my computer of at the power button because there was no way out. This has happened a few of other times, when there's lots of graphics and movement on the screen, like in TW and other instances. Any advice would be really helpful, thankyou b:cute

SylenThunder - Twilight Temple

Sounds like your GPU is overheating.
Could be several reasons though, why don't you provide some actual information?