IMac G4 800 17inch won't boot.

Hi,
I posted a topic some months ago about a problem I was experiencing with an old G4 iMac I own. The problem is still not fixed so here's an update of the problem.
Spec;
iMac G4 17inch 768 mb ram, Airport card, OS X 10.2.8
When you turn on the computer all i get is the grey screen with the apple logo. No spinning timer to say its booting up. It stays like this until you turn it off.
What i've tried so far;
All usb devises etc have been disconnected ( only keyboard and mouse left)
Reset the PRAM
Reset the Power management unit
Inserted the installer disk, held down C but still it won't boot to the installer / disk utility options. However the timer wheel appears but nothing happens
Any help would be greatly appreciated. I'm at a lose end as to what to do next!
Thanks

Hi! You've tried most things but try holding the "x" key down at boot and if that doesn't work try the shift key. have you tried the hardware test disc? Tom

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To The Apple Discussion Boards!
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