IMac really stuck at grey screen - tried everything

Hi,
everytime I try to boot my iMac it gets stuck at the first grey screen. No logo, no loader, nothing but a grey screen.
I have tried everything here > http://support.apple.com/kb/TS2570 > with no results. The grey screen remains there, with no changes.
The only thing that seems to work, but only for a seconds, is holding the option (alt) key at startup. After a few seconds, the pointer of the mouse appears. And then, a few seconds later, it gets stuck too. That's the farthest I've managed to get.
I can insert and get install DVDs back, but they don't seem to load.
I've tried also DiskWarrior, with the same results.
Any ideas?

Hey jflam sorry to hear that. I know how frustrating that can be. One thing that the article doesn't mention that I'd try is repairing the disk from single user mode.
Boot to single user mode by holding down command-S at startup.
-If it works right it should take you to a black screen w/ white letters.
-Then just follow the steps in from this website. http://homepage.mac.com/geerlingguy/mac_support/mac_help/pages/0009-fsck_su_disk _repair.html
-Make sure if it tells you the disk has been modified that you repeat the command.
-If it says it's ok or if you can't boot to single user mode then it sounds like a hardware problem. You'd have to take the computer into an Apple Retail Store or Authorized Apple Service Provider to get your options on how to fix it.
Best of luck!

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