Hi all, I'm looking for a bit of help. We are not an Apple authorized partner but we do upgrade macbook and imac RAM and SSDs. We've upgraded dozens without issue but we are having issues with a 27" late 2012 imac. We upgraded to SSD and did a clean install as the old drive could not be cloned due to bad sectors. We also replaced one of the useless plastic washers on the spring for the stand. However, since putting it all back together, we have a vertical black portion on the screen about 3 inches wide. I booked it in to see an Apple Genius who warned that because we're not Apple certified, they'd probably charge but after a brief look, suggested it was the display cable. However, I have since replaced that with the same issue. Sometimes the lower portion of the display will go blank/pixelated but not always. Next step would be to replace the display but I hear it could also be bad solder in the display cable socket. Either way it's probably going to be expensive for me as I'll undoubtedly have to foot the bill for my client (or our insurance company will). I've attached 2 pics hopefully showing what's wrong. We took everything apart to do the upgrade and repair taking our usual anti-static precautions and were extremely careful removing the screen, disconnecting cables etc. We've ruled out an OS issue as we've tried other hard disks and the black display portion appears at boot up too. We've also plugged an external display through the mini-display port and that shows perfectly so ruled out a graphics issue. Any advice would be appreciated. I'm frustrated that probably fixing the self-leveling mount (which was poorly engineered in the first place) has probably caused the issue and I should have just stuck to the RAM upgrade. The older iMacs are fine when it comes to upgrading to SSD but the fact you have to cut through the double-sided tape on the newer models means I probably won't bother attempting upgrading anything than RAM on these anymore. I've been working on PCs and laptops for over 10 years with no major issues so I know what I'm doing when it comes to electronics repairs but this has seriously put me off upgrading Apple kit and I'm certainly not shelling out the ridiculous fees on becoming Apple certified! Any help would be greatly appreciated. Thanks.