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You can usually tell a bad GPU from these symptoms on bootup:
- Bootup screen with a blue hue or wide bars on it.
- White screen after loading bar
- only boots to safe mode or single user mode.
Failing GPUs are most notable in
- 2009-2010 MacBook Pro 15"/17": This model is often diagnosed with failing GPUs when in fact they have a bad capacitor. We repair that board level problem at $199.
- 2009-2010 iMacs with GPU: This model has a higher than normal failure rate. We can repair them, check current prices and multiply by 2.5x.
- 2011 MacBook Pros 15": This model has a GPU with a high failure rate. We do not fix this board problem. The bypass does not allow brightness control or external screen. We will replace the LB with a 2012 model. The customer will get USB 3.0, a faster CPU, a faster GPU, and the ability to upgrade past High Sierra. This repair is $799
- 2011 MacBook Pros 17": This model has a GPU with a high failure rate. We do not fix these. The bypass does not allow brightness control or external screen.
- 2011 iMac 21.5"/27": This model has a GPU with a high failure rate.. We do not fix these. There is no bypass and it is difficult to get a good quality part at this time.
- 2013-2015 MacBook Pro 15" Integrated Graphics (IG): This model has CPU buck converters that tend to crash the computer while waking from sleep. The transition from SUS power state to S0 causes the issue. We can sometimes repair these by replacing the CPU MOSFET controllers at $299
- MacBook Retina 12": This model can sometimes get the pixelation effects associated with GPU failure. Unfortunately the CPU is failing in this model. It warps due to heat over time. We are not able to repair this board. We would quote replacement, or divert them to the Apple store for the flat rate repair.