Lots of horizontal lines appearing, is my file corrupted?

[Vivien Wu]

This CMYK PSD file I'm working on has been having weird horizontal "noise" like lines appearing all throughout, as I'm working on it. One second it'll be fine, but then if I zoom out or move the screen wrong, the lines will start appearing again.

I can actually go in and color-pick these line colors, so it's not just noise on my screen; the lines appear to be embedded in the file itself. I cannot click undo or erase them in any way. Any idea what's going on?

[TheDigitalDog]

First, try disabling GPU in the preferences (Preformance tab). Any better?
If not, go to Preferences > Technology Previews... and check "Disable Native Canvas" - then restart Photoshop. Better?
If not, recalibrate and build a new ICC display profile, the old one might be corrupted.
If you are using software/hardware for this task, be sure the software is set to build a matrix not LUT profile, Version 2 not Version 4 profile.
If turning OFF GPU works, it's a GPU bug and you need to contact the manufacturer or find out if there's an updated driver for it. 
Also see: https://helpx.adobe.com/photoshop/kb/acr-gpu-faq.html

[Vivien Wu]

I wasn't able to find where GPU preferences were, but looks like the second one worked! Thanks a lot.