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.
