Has anyone had success doing the process blindly? With R8911 removed, it will boot but with no display to manually type in the commands. MBP won't boot with R8911 installed to apply a suitable SW fix. It seems I'm stuck at a chicken and an egg problem. I think I found my missing piece of information in another reply by dosdude1. What controls the screen and backlight display? Is it the integrated GPU? I think I'm going to try removing the logic board and reflowing the CPU and GPU using a heat gun to see if that will help.Īny other ideas from the geniuses that frequent this thread? I unbridged it and I got the chime sound again. ![]() So, is my Intel integrated GPU also dead? I tend to believe my dedicated GPU is dead as I later bridged the R8911 resistor and the computer stopped booting and stopped giving me a startup chime. I took my flashlight on my phone and shined it through the white apple logo to see if I can see anything on the screen and it only shows up with the green/gray turned off LCD state. But I could hear all the reminders popping up. I was able to logon to my user account in OSX, but the screen was still dark. So I booted Arch linux on CD, it booted up, but the screen was still dark. I suddenly got a startup chime once and then again because of the PRAM reset. So following the manual hardware mod on ( ), I removed the R8911 resistor. I would never get the screen to display or startup sound or CAPS lock key to light. Did numerous boot key sequences (single user, safe mode) - No change I reset PRAM numerous times - No change I pulled the hard drive (to keep it from getting corrupted with sudden power-offs) - No change I pulled the swollen battery out of the MBP as it was messing with the clickpad - No change Now it is permanently stuck in that state. Then it wouldn't boot and would hang with a black screen and no startup chime until everything cooled (?) down and the battery discharged. I had the typical crashing and artifacts when the GPU would hang. I have spent days reading and searching this thread for anyone with black screen symptoms like mine. I just gotta start by giving a huge thanks to the contributors of this thread as I was pulling my hair out and not wanting to admit defeat when my 15" MBP's (8,2 model) screen went black for the last time. Right now I get things done on my Macbook having invested only 10 US$ for that script from realmacmods. Not the most elegant solution and indeed not permanent, so not protecting against tricks Apple may pull to prevent this method to work in the future. Milleage may vary depending on the severeness of the failing AMD GPU in other case, but it works for me. in High Sierra I have gfxcardstatus 2.1 running to "make sure" in all power scenario's the integrated gpu is being used, not sure if this is required, just as an extra monitoring tool Keeping the USB stick at hand and just having to type the two lines of Linux command every reboot is much easier and less risky than all the soldering work. two lines of linux command to activate their script, shutdown and I can reboot again ( for example to let a High Sierra update complete or just normal restart - if I don't do this: grey screen after Apple progress bar) Whenever reboot is required (update) I use the USB stick to boot into Ubuntu from the that SSD and USB based reboots are so fast taking into account that I rarely reboot my Macbook, ![]() Unobtrusive i and d icons denote whether your MacBook Pro is using its integrated or discrete GPU.Currently I just stick to using the USB stick whenever a restart is needed. Simple, clean user interface: gfxCardStatus is super simple. GfxCardStatus is an unobtrusive menu bar app for OS X that allows MacBook Pro users to see which apps are affecting their battery life by using the more power-hungry graphics. You can even force the laptop to use integrated graphics when you're trying to conserve battery power. With gfxCardStatus, you can see when your dual-video-card-equipped MacBook Pro uses each GPU. ![]() Power Mac G3 or Mac Server G3 came with a single channel Ultra2 low voltage differential (LVD) SCSI card, run the '2940U2B v1. GfxCardStatus is a free menu bar application that keeps track of which graphics card your MacBook Pro is using at any given time. I am on Yosemite 10.10.1 I also have FileVault enabled, so I am seeing the broken discrete graphics right from the start when I am prompted for my password, long before any driver from hard dis can. Gfxcardstatus 2.3 complains it can't switch to internal graphics because there is an external display connected (not true), 2.2.1 just doesn't work.
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