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Hi, I need your help again please. My iMac has a problem with it’s graphics board: Radeon HD 4850 ROM Revision: 113-B9110C-425EFI Driver Version: 01.00.383 I’ve sent it to Apple service 2 times now and they can not repair it. They tell me they can’t find a new one to change it. The screen has small vertical lines that flicker, a week ago it was the same and when it closed it did not open again. The screen was black Please help me! Thank you Update (02/19/2018) Hi Dan thank you for your answer my iMac Model Identifier: iMac11,1 Processor Name: Intel Core i5 Processor Speed: 2.66 GHz Number Of Processors: 1 Total Number Of Cores: 4 L2 Cache (per core): 256 KB L3 Cache: 8 MB Memory: 12 GB Processor Interconnect Speed: 4.8 GT/s Boot ROM Version: IM111.0034.B04 SMC Version (system): 1.54f36 Hardware UUID: D49C3552-C234-5C71-9C45-74FF5FF9D47D
The GPU board in your system is a premium GPU at the time. Not many people bought the high end system with it, so getting a replacement will be costly! Most are used boards taken from dead or part systems. So you do need to be careful where you buy it as they may not offer a replacement or your money back! Here’s one source I have faith in for the GPU card: ATI Radeon 4850 HD w/512 MB of RAM - Apple P/N 661-5315 You might want to think if putting additional money into this system is worth it. While still a good system, depending on what you are doing you might find a newer system will offer more performance. Yes, the newer systems are more locked in and maybe you just want to hold off until Apple intro’s the new Mac Pro as its claimed to be a modular system. The new iMac Pro is a mean beast which for many may offer the needed performance but it does come with a cost.
