I had the same problem with an old ECS board I had so I picked up an extender at the local Fry's. It was just too damn tight for me to be comfortable with.
Incorrect, that guy respecs skills not the masteries. No way in game to respec masteries.
What he needs is TQDefiler.
http://www.demortex.com/apps/tqdefiler/SSTQDefilerFULL.zip
I hope you're running XP as I've never gotten it to work right on Vista.
I'd also recommend checking out...
8800GT requires 28-22A(depending on manufacturer) on the +12v rail(s) and that PSU is rated at +18A. Your PSU is mostly likely the cause based on that info.