Late 2009 27" iMac White screen at startup after replacing hard drive.
So I have a late 2009 C2D 27" iMac (A1312 EMC 2309)
I just replaced the hard drive. I reassembled it, it powers up, I get the startup chord, and the screen goes full white. No access noises for either HD or internal SuperDrive. I cannot install from the commercial Snow Leopard disk (holding down the C key at boot did nothing)
I checked and found that the mobo end of the thin, 4 conductor flat ribbon cable (Vertical Sync) had gotten munged, so I replaced it, but I have the same symptoms.
Does anyone have any input on this? LVDS cable, maybe?
Is this a good question?