I removed the screen on my iMac 27 5k because there was a noise that I thought came from the cooling fan. I cleaned it and the issue was resolved but once I put it back the screen had a 3/4"(18mm) wide black strip going from top to bottom. I opened it again thinking that I could be a piece of dust caught in the connector that kept that area from displaying. I cleaned the connector as best as I could but the full black strip -as black as the surrounding bezel- remained. Luckily is way to the left about 4" from the right edge. After about a week I found the screen had overnight fallen off and therefore the crack I mentioned. This crack, again luckily its only on the top right corner and covers about a 4 inch sq. area without damage to the image area. Unfortunately I used a no-name replacement set of glue strips. Maybe that's what caused the thing "coming unglued" or I didn't clean the old remaining tape well enough.
Any thoughts on what might have caused the black strip? Thanks
