IMac (Mid 2011) screen randomly becomes black, not to do with energy saver. I think it may be to do with hardware.

I have tried SMC, PRAM resetting etc. I've triple checked my energy saver settings, currently they're on:
Computer Sleep: 1hr
Display Sleep: 1min
Wake for network access
Allow power button to put the computer to sleep
And I know full well that its not the 1min display sleep that's doing this.
I've read on other posts that it could be a hardware issue, as in the graphics card is failing. I don't have the money to replace the graphics card, not to mention, this particular model is difficult to open up or customize.
I think I need Apple to give me a replacement LCD or take a look at the hardware. I've only had this computer for 2 yrs and it was bought brand new, so its surprising that this has happened.
In the past I have had other issues like a kernel panic, and to a point, overheating & sluggishness.

If you have AppleCare and the display is indeed failed Apple will replace. If you did not purchase AppleCare then Apple will not replace it for free, that is why AppleCare exists. However I suspect there is a software problem, I'd recommend creating a new user account logging into it and then test, if the problem disappears then you know it's a  software issue in your primary user account. If it does not go away then you only know is a universal issue for your machine. Try creating a new user account and then post the results.

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