I thought, if I could get Logic board changed, I should be okay, but in many forums many users who got that done were not still immune from that problem. The machine is a 15″ MBP 10,1 (mid-2012) with dual GPU system. I missed the replacement program (as I was not even aware that it existed until I hit this problem) and now my machine is out of warranty (more than 51/2 years now). So, I started Googling for this GPU Panic problem and found that many laptops had this issue and that many forums said it was all due to a faulty discrete GPU on the logic board. Kernel Extensions in process name corresponding to current thread: kernel_task Panic(cpu 2 caller 0xffffff7f916c29cf): "GPU Panic: mux-regs 4 0 a0 99 0 8 severity 3 WS-ready 1 switch-state 3 IG FBs 1 EG FBs 0:0 power-state 3 3D idle HDA idle : AGC GPU REGISTER RESTORE FAILED : rdar://7254528, VendorID (CPU 2), Frame : Return Address Sometimes, upon restarting the first problem message that I got was GPU panic like the one shown below:Īnonymous UUID: 32BD6DA8-14C2-38AD-E466-F3B6DDCE6F7F But as soon as, I started using it, all of a sudden it would show a Black Screen, but CAPS LOCK would still glow green and so I would then reboot it again, only to Black screen. I got my MacBook cleaned and then it booted fine. I tried all that, but it refused to work. I started asking myself why would this happen? Was it due to upgrade to High Sierra 10.13.3 or was it that my machine really developed some hardware problem? I asked a friend of mine what can I do and he suggested SMC Reset followed by PRAM (NVRAM) Reset.
After that, many times I would boot straight into Black Screen, and the only sign that the machine was awake could be just tested by pressing the CAPS LOCK key (turns on the button-light) or connecting an External USB with a indicator light. It all started when my MacBook Pro showed me black screen after waking from sleep.
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