On several occasions, hardware was replaced (before the REP), and after a period of time, the problem resurfaced. Generally, before the Repair Extension Program described next, when customers took their Mac Pro, under warranty or Apple Care, to an Apple retail store, it passed all the hardware tests, leaving the customer frustrated.

Changing out the miniDisplayPort to DisplayPort cable.

Using the HDMI port instead of TB/DisplayPort.

Getting a replacement Mac Pro or new graphics cards (D300 only).Upgrading to OS X El Capitan from Yosemite.Here are things mentioned that do not consistently work. Many of the postings describe historical attempts to fix the problem in various ways. ' Mac Pro (Late 2013) GPU (Driver) Issues.' The discussion spans over a year, 29 pages and 702 posts. PM WindowServer: GPU Driver appears to be hung (over 5 continuous seconds of unreadiness)Īn exhaustive discussion of the problem appears in this forum. Inspection of the Console log file by customers has revealed several different errors, but the most common are: Kernel_2015-xx-xx-xxxxxx_Mac-Pro.gpuRestart The community appears to concur that this is a graphics card issue or an internal bus issue. The problem happens sporadically, sometimes several times a day and sometimes doesn't happen for weeks at a time. The user is unable to recover control of the Mac Pro by any keyboard action, and holding down the power button until the Mac shuts down is necessary. The most often reported symptom is a lockup of the Mac Pro with a spinning beach ball. One workaround that does not solve the problem but assists with handling the freeze-up is often cited in the MacRumors forum and is discussed below.

The D300 isn't covered, but it also experiences freeze ups, according to customers. Apple launched a repair program in February, but only for Mac Pros with the AMD FirePro D700 and D500 graphics cards. A non-negligible number of 2013 Mac Pro owners are experiencing intermittent freezes no matter what remedial action is taken or the version of OS X installed.

Imac keeps freezing late 2016