had availed of the logic board replacement scheme for 2011 MacBook Pro's with faulty (AMD) graphics cards. The laptop came back from servicing with a new (refurbished as I understand) logic board. But while running a benchmarking test (Unigine Valley) the on screen graphics are extremely pixelated.
The service center suggested it was due to a faulty RAM. So I purchased new identical RAM. Same issue. After months of struggling with AppleCare and Apple Exec relations, they first asked me to get a clean install of the latest OS. Once that was done, the feedback from their engineering team is now that it "could be" due to the defunct trackpad (condition since before the repair, and I use a USB or bluetooth replacement, instead of replacing it out of warranty).
Is it at all possible that the screen graphics are pixelated because of a defunct trackpad?
I fear I am being scammed by Apple to pay for a pointless hardware repair...
The trackpad is actually not connected - the cable connecting it to the logic board is gone, so it is just out of service / disconnected. I am running stock OS and it works fine. The benchmarking tool works fine on other MacBook Pros. The trackpad has been out of service since before the repair, and this problem with the benchmarking test is after the repair. So I believe it is unrelated.