vertical lines white background
I have a 27"iMac that I am working on. When I turn it on, I first get a white background with 4 or 5 vertical stripes. If I leave it alone, it will eventually go to an all blue screen.
I was able to boot into safe mode. The screen looked fine. I had the OS X install CD in, so I decided to reinstall the OS. It said it would take about 55 minutes.
Then the screen got all kinds of wierd pixels in it, making it impossible to read. I turned it off by holding down the power button.
Now it seems the OS is gone, and did not complete reinstall. Holding down the shift key DOES NOT put me in safe mode. It seems to be attempting to continue with reinstall (I can hear the CD/DVD).
Now I just get a blank light-blue screen.
The vertical lines on the white background are persistent at startup.
Any ideas?
iMac, Mac OS X (10.5), I'm guessing at the OS version