Chosen Solution
I have an 2011 Mac running 10.12.6. The Mac turns on but is displaying a black/blueish tint. There is no icons or cursor. Upon turning it on, I do hear the startup chime and DVD player so I know there is power to internal parts. I do feel the fan blowing through the vents. Nothing appears on the screen. None of the USB ports are working and thunderbolt port is not working either. If I remove the RAM, the computer does recognize there is not memory. The Mac was working before and it was plugged into a power strip. So, I don’t know if something got zapped. Other users thought it was the video or inverter card that is bad.
Hook up an external monitor to help diagnose the issue. Let us know your results. The next step would be to open it up and look at the logic board diagnostic LEDs.
Have you tried a SMC and PRAM reset? (Use a wired keyboard for this) I’d also try starting in Safe Mode and if all else fails try Internet Recovery. There was a recall on the graphics cards of 2011 iMacs but I think it was only the 27”. Whereabouts are you located? If you are in the EU, consumer law might still cover the iMac (6 years of repairs) as long as the machine is in perfect condition. Let me know how it goes!
