My late 2009 27" i7 just started up with pink and green vertical stribes. I can't get it to boot to the desktop, -it stops at the apple logo. I can however boot from the hardware test DVD and run the tests and it reports no problems (still with stripes on the display). I use a DIY fusion drive I installed about a year ago. could it be a bad display connection? Also tried to boot from an external disk with the same result :-( (the imac freezes at the apple logo) Any suggestions?