Imac late 2013 27in model stuck on 1280x720

[Jmsliu912]

Hi, I recently just turned on my mac and the resolution was stuck on 1280x720 on my late 2013 27in mac. The standard resolution is 2560x1440. I can't find the option for it in the display settings, and when pressing the option button, the only other one available is 800x600 or something like that.

I tried a PRAM reset with option+cmd+r+p, but all that did was cause the mac's screen to be black with horizontal streaks of white, but then when I restarted it again it went back to being on 1280x720 and blurry and zoomed in.

I saw on the apple forums that someone said to reinstall macOSX, but I don't want to lose any data on my hard drive, as this computer contains a lot of important files.

Does anybody know a solution to this other than taking it to the apple store?
Thanks

 

[Nguyen Duc Hieu]

Hi, I recently just turned on my mac and the resolution was stuck on 1280x720 on my late 2013 27in mac. The standard resolution is 2560x1440. I can't find the option for it in the display settings, and when pressing the option button, the only other one available is 800x600 or something like that.

I tried a PRAM reset with option+cmd+r+p, but all that did was cause the mac's screen to be black with horizontal streaks of white, but then when I restarted it again it went back to being on 1280x720 and blurry and zoomed in.

I saw on the apple forums that someone said to reinstall macOSX, but I don't want to lose any data on my hard drive, as this computer contains a lot of important files.

Does anybody know a solution to this other than taking it to the apple store?
Thanks

The Apple Store can keep your data?
This is new to me.
AFAIK, they always insisted that all of your data will be lost after going through them.

The best solution for your case, (according to me) is copy all of your essential data to an external drive, then take it to any store that can handle iMac, not the Apple store and ask them to replace your HDD with a brand new SSD or two, freshly install OS to it, then you can copy back your data to the internal SSD.