iMac won’t boot into internet recovery mode.

Hey guys,

So my Late 2012 iMac wasn’t booting up at all (I’ve tried everything to no avail), and when I took it to the Apple Store they said that the hard drive was failing. So I decided to backup everything and get a new SSD. The new SSD is in the Mac but I cannot do anything. Internet recovery mode stops at the end (the apple logo appears and the spinning wheel but its frozen) and I don’t think it’ll get past that. I was thinking maybe I could somehow use target disk mode to fix it but when I use target disk mode it my other Mac doesn’t see it (possibly because the internal SSD is not mounted?). I am really stuck and angry since it took me a lot of time to install the SSD. Is there any way I can fix this? I can boot into verbose mode to try and see if any of you guys can spot an error too. Any help would be greatly appreciated.

P.S The initial drive wasn’t working either (same issue, cant boot into anything). However, after using internet recovery mode I left it overnight and I saw that the display was off but the computer was still giving power (the mouse was powered on). Faulty GPU maybe?