screen internal iMac 2009 has stopped working

Hello world

I recently made a bunch of system updates (I've been long) and my internal screen no longer works. At startup, the gray screen appears and then goes to black before loading the full operating system. I connected to an external monitor that seems to work without problems. Every now and then when I wake up my computer, the internal display works for up to a minute then goes black again.

I tried some basic troubleshooting things that seem to help: 1. turn off the computer, unplug and leave for a few hours. 2 reset the NVRAM 3. I tried to run AHT but I'm do wrong ("D" of operation at startup) or I do not see the it, as my external display only started working once the operating system has started.

I wonder if it's a hardware problem or a software problem or even how I know.

A few years ago, I upgraded to 32 GB of RAM, which is not officially supported but have not had any problems with the computer since I did the upgrade.

I'm on an iMac 27 "2009. MC507LL/A

Any help would be greatly appreciated on how I can fix this, or at least to know the cause of the problem. Please let me know if there is any additional details that may help to resolve the issue.

Thank you very much!

You have the same problem if you try to restart in RecoverHD?  If you do,

Then, you can pretty well assume that you have a hardware problem.

If the startup in RecoverHD works fine, then restart normally with the external display

and back up all your data as a precaution.  Then reboot in Recovery and reinstall

OSX.  He should ' t do anything else, but the backup must be just in case.

Tags: Mac

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