[skyrick]

Hi all,

I've a iMac 24" and I would like to resell it urgently.

But I've a big problem, if I disconnect my second display (belinea 20"), the iMac screen become grey or blue after many second.

If I boot system, after the grey clock : nothing, grey or black screen.

The Os is snow leopard disc, update version (10.6)
The iMac version is iMac8,1
The EFI bios is : IM81.00c1.b00

I tried :
- Reinstall 10.6 with format (normal and zero write format system)

- Utility disc on boot cd (scan disk & rights repair)

- Try to boot cd without second screen
> I've white screen (after a update to 10.6.4)

- Try PRAM reset
> no working

- Try a 10.5.2 install (delivered with the iMac)
> I've directly a grey screen just after boot with cd : no install menu appears

You can see my post on apple forum here

Help me please

[ibook_steve]

Sounds like a bad graphics chip, requiring a board repair.

Does it work fine only in mirror mode or extended display mode?

Steve

[skyrick]

Hi,

Working well when the external display is connected (miror mode or not)
But with only the iMac display : doesn t work (white, grey, black, pink or purple screen)

When I boot in safe mode : work well with no external display
When I stay to the login screen : work well too

Help me