How to determine what is cause of white screen on my iMac
24" iMac 2006 - A1200 EMC 2111 MA456LL
My iMac won't boot up.
Goes into white screen after apple and spinning gear.
Hard drive has been checked out by local computer repair shop as okay.
Makes all the right noises on startup before the apple and spinning gear.
Holding down option key on startup works ok. Shows the partitions on the hard disk.
Holding down shift key on startup doesn't work. Goes into white screen and stays there.
Holding down D key on startup doesn't work. Goes into white screen and stays there.
Holding down command V (verbose mode) gives a 3-4 page list.
Resetting SMC, PRAM, safe mode doesn't work.
Prior to failure didn't give any indication that video card was failing. I.e. no lines, no break up or distortion of images.