![]() Questions? Comments? Have a fix? Post them below or e-mail us!īe sure to check us out on Twitter and the CNET Mac forums.On Mar 17, 2017, at 1:37 PM, mrillex wrote: Apple may be reluctant to do this, especially if its technicians cannot find any problems when testing the machine, so be sure to insist that this be done when you talk to the Apple technicians, especially if you have tried all other routes and workarounds. Most people who have had this done have found the problem has disappeared completely. Therefore, until Apple addresses this problem specifically with some sort of firmware update, then the only true fix for this issue at the moment is to have your system's motherboard replaced. The above workarounds and fixes will likely not fix the problem fully, but just provide a more tolerable working environment for the issue and thereby allow the system to function without showing the problem, or at least reduce the prevalence of the problem. The preferences contain GPU switching instructions for various power modes, which may be what is triggering the problem for some systems. Remove this file and restart the system, and that may help the situation, especially if the problem only happens after waking from sleep. The preferences are located in the /Macintosh HD/Library/Preferences/SystemConfiguration/ folder and are called "." This issue may also be rooted in how the system is handling power settings for various power sources (battery or wall power), and some people have claimed success in preventing this issue by removing the power management preferences so the system will rebuild them. In addition, you can try monitoring your graphics processor temperatures using a tool like Temperature Monitor, to see if any spikes in the graphics card temperature are occurring on your system. Try installing the program and adjusting the fan speeds to see if that helps. The utility SmcFanControl can be used to govern the fan behavior on Mac systems, and for some people forcing the fans to run at high speeds has reduced this problem, if not eliminated it. Merely installing GfxCardStatus will not do this, so be sure to configure the program to only allow the internal GPU, and the black screens should stop. Regardless of the specifics, you can install GfxCardStatus and use it to force the system to run on the onboard GPU, which should fix the problem. The problem has something to do with the discrete graphics card on the system, whether it is with the power management or heat management of the unit. This indicates the problem is rooted in the hardware of the systems. In a few cases the problems were still present, but were fixed by having technicians replace the motherboard yet again. As a result, many of the computers sent in for repair have been returned without the technicians being able to replicate the issue, only to have the problem show up again.įor a number of systems, Apple support has replaced the logic board which contains most of the system's components (CPU, GPU, controllers, and so on), and for these systems the problems have disappeared. Even after over a month of testing and investigating the problem, users have not been able to replicate the problem on demand. ![]() It appears some problem with handling the GeForce 330M results in random occurrences of the black screen. While some iMac and Mac Mini users have reported this problem, the issue seems to primarily affect MacBook Pro systems, and specifically the 15-inch and 17-inch Mid 2010 models which used the Nvidia GeForce 330M GPU. ![]()
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