Late 2014 iMac 27” - Possible fried graphics chip??

[Bcaruso22]

Hello all, new to the forum and I am hoping someone can confirm my suspicion.
As the title states, I own a late 2014 iMac 27”. A few days ago my screen went all haywire and ended up having to power it off with the button. I let it sit for a few and turned it back on. I was greeted with a screen I’ve never seen before. Lots and lots of white and black rectangles. I’d get the Apple logo and progress bar in a clean area. The white would turn a reddish color and then I’d get a message stating it had an issue and was rebooting. This was an endless loop.
I’ve tried resetting all the go to things. NVRAM, SMC, etc… I noticed I’m not hearing my fan on boot up, haven’t confirmed if it is or isn’t working yet. I’m thinking I had a fan fail and over heated my graphics chip.
Any thoughts?

 

[Raz0rEdge]

That first screenshot shows that you had a Kernel Panic that caused a crash. The bad images does seem to indicate that something is messed up with the graphics card. You should try connecting an external display and see if that also has issues. If so, it's entire graphics system. If not, then it's like your iMac screen only.

 

[Bcaruso22]

That first screenshot shows that you had a Kernel Panic that caused a crash. The bad images does seem to indicate that something is messed up with the graphics card. You should try connecting an external display and see if that also has issues. If so, it's entire graphics system. If not, then it's like your iMac screen only.

I forgot to mention, but I did have a second monitor attached. However it never shows anything until I am logged into the desktop. I do not recall if it ever received a signal or not though. I’ll check it out.

thank you for the response!

 

[Raz0rEdge]

If you do manage to get the iMac to get to the login screen, you should see your background image on the second screen.

 

[Bcaruso22]

If you do manage to get the iMac to get to the login screen, you should see your background image on the second screen.

Never able to get to login. Also was unable to boot to recovery. It would just constantly crash and restart.

 

[Raz0rEdge]

You might want to try holding down the SHIFT key during bootup to see if it will get into safe mode. But, if you can't get into recovery mode, then the issue is more than just a graphics card issue, you might be dealing with a logicboard failure.