What is the problem with my iMac mid-2011


Need help find out what is the problem with my iMac to mid-2011.

Yesterday during a reboot it just never came to life.

On turning the power on, I get the RINGTONE to start and that's it. The screen is totally black. Nothing behind tried with a torch.

VRAM rearmament so far I tried repeatedly, unplug and plug, all kinds of combinations of keys in the carillon and nothing.

Connected to an external monitor and shows nothing of too - no signal.

Any way that I can know what is wrong with it before sending it to the service tech? I suspect bad graphics card but how do you ensure?

From what you describe, it looks like a hardware issue that Apple will only be able to resolve, but not to despair immediately.

Read it please get help with graphics issues on external displays connected to your Mac - Apple Support.

I know that the title and subject are not suitable to your concern, but buried in this document is the following passage that contains three links describing the steps to follow.

If you can not change the resolution of your screen because you see no image, restart your Mac in safe mode to reset the default display resolution.

If booting safe mode doesn't resolve the problem, reset your Mac NVRAM and SMC to reset the video ports on your Mac to their default values.

That first, then write again for additional suggestions if you are still having problems.

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