Howdy- Started up my Quad G5 this morning to discover what appears to be some video card issue. At least that's what I'm guessing. Here's the deal- seemingly random processes (moving windows, opening windows, opening programs, etc.) create single-pixel width horizontal lines of varying lengths in seemingly random places of the screen (I'll try to grab a screenshot next time). Any guess what this might be? I always thought video card failures occured on a much bigger scale- i.e. fully garbled screens, color casts, etc. It's pretty worrysome, and a permission repair didn't seem to solve it. Any way I can run a hardware test? Thanks!