IMac late-2006, cannot boot, white screen. Please help!

I got white screen whenever I boot the computer.
I have tried all of the followings.
- detach all peripherals
- safe boot
- reset PRAM / NVRAM
- boot from Recovery HD
- boot from USB Recovery drive
- boot from Snow Leopard installation disc
- boot from Windows partition (results in blank black screen)
- boot from Windows 7 installation disc (results in blank black screen)
Nothing works.
My configuration:
iMac (late-2006)
Mac OS 10.7.1
3GB memory

Hi,
I had the same problem.
How I solved? I simply haven't touched the iMac for 2 days...
Than iMac has successfully booted.
I contacted the online support but they have not been able to give me an explanation...

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