Hi
I am in the UK so prices would differ...my laptop repair company would diagnose it for a half hours labour (£27.50)
But I don't know about US prices...
Worst case is graphics chip gone on motherboard, entailing a new motherboard...and at least £200 plus (including labour)
With the graphics drivers..i meant you to download onto another machine , put them on a usb stick and install them in safe mode...although SAFE MODE WITH NETWORKING should work...
All the best Brett