Chosen Solution
Could i replace GPU in my IMac late 2012 or it’s fixed in the mainboard so there is no way to fix or replace it in this mode A1418 imac late 2012 Update (11/05/2018)
This is what appear in my screen
@shadyahmed - Sorry guy your issue is a bad display! Not a logic board issue. The bars are caused by a broken LCD screen. In fact, I think I can see the point of contact and a crack in the right midpoint. Did the system fall over or something thrown at it? Or did it get shipped to you and got damaged then? Here’s the IFIXIT guide you’ll need to follow: iMac Intel 21.5" EMC 2544 Display Replacement and here’s the needed part: TheBookYard UK - iMac 21.5" LCD Panel & Front Glass Assembly - Grade-C, Apple P/N 661-7109 and you’ll need this toolkit and tapes [linked product missing or disabled: IF173-005-1] Make sure you follow the IFIXIT guide don’t jump ahead as the process of taking off the display as you don’t want fragments falling off.
