iMac 27" black lit screen
I have an iMac and it’s driving me mad… It starts up and chimes. The screen is black but lit. I have put a torch right up to the display and can see nothing.
I have took the mac to TFix a UK computer repair center and they have done the following:
Replaced the LCD cable and LCD connections the issue was still present.
We have attempted GPU reball, which has not resolved the issue.
We have purchased and installed new updated GPU chip after installation the original fault was still present.
We have tried to source replacement GPU card however none of our trusted suppliers had any in stock.
I ordered a graphics card before I took it to TFix and it arrived whist it was being repaired.
I put it in and now I have an output on an external monitor and I get the OS-X desktop. I can dim the brightness of the internal display and when I used the volume keys on the keyboard I get sound.
I also bought a new display from ebay but its the same just black and illuminated (however that could be faulty also?).
I can't see how this is a the logic board failure if I can use an external monitor?
Any help would be appreciated thanks
Is this a good question?