Purchased a new screen cable and now monitor is 1280x720 only.
I opened up my iMac to replace the HDD with an SDD. I damaged the screen cable trying to plug it back in. I purchased another screen cable, but now I only have the option for 1280x720 (720p image stretches to fill 1440p so it looks almost 8bit). 2560x1440 works fine on my external monitor.
I've tried reseting the PRAM and reinstalling OSX
Tried both of these replacement cables (same result with both):
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