Need help with screen

[fmalvar]

Hey there!

So I have an iMac 2012, and last December I switched my hard drive to an SSD at an Apple certificated store. In February one day, it got "lines" all over the screen when I open for example a browser or a video. If nothing is running, it looks fine. Have they screwed something up when changing the hard drive or it´s something else?

Thank you for your time, stay safe!

 

[chscag]

Could be graphics related. Attach a monitor or TV to your iMac to see if the same thing happens on the external monitor or TV. If the display is normal on the external, then it could be a loose video cable or connector or one that's failing. If the same lines appear on the external monitor or TV, then it's likely a problem with the iMac graphics board.

 

[fmalvar]

Could be graphics related. Attach a monitor or TV to your iMac to see if the same thing happens on the external monitor or TV. If the display is normal on the external, then it could be a loose video cable or connector or one that's failing. If the same lines appear on the external monitor or TV, then it's likely a problem with the iMac graphics board.

Newbie here! Can it be tested with Airplay too?

 

[chscag]

Newbie here! Can it be tested with Airplay too?

I don't know if it can. The best way though is to attach the external monitor or TV using a connecting cable with the proper adapter.