mac pro late 2013 freezes with spinning wheel

Hi maxcarella

I have tested the setting sudo nvram boot-args="dart=0x0" on 1 of my problematic MacPro's and the result with the screensaver test is the same. A freeze within 48 hours.

Anybody knows how to see if the settings are really set? (edit: nvram -p in the terminal shows this)

result: it was not set after 1 try, I will start testing again

Hi All,

Today 1 of my Mac Pro's returned from Apple repair. During the first repair the MLB was replaced without any result.

This second try Apple replaced the I/O Wall and Inlet, and replaced 1 of the 2 D300 videocards with an upgrade to D700.

So my machine has now 1x D300 and 1x D700 installed. I will do my testing and keep you all updated.

Still getting lock-ups with nvram setting. Guess I'll be making my 5th genius bar appointment this weekend. Sigh. Nearly out of warranty on this thing. They'd better admit that there's a problem this time.

I can also confirm that the lock-ups are continuing after adjusting the nvram setting.

Like many others in the thread when the freeze occurs music still plays in the background. When I unplug the thunderbolt display and plug it back in, it becomes responsive again but very sluggish.

To be honest, I'm really tempted to sell the computer but feel unethical about knowing the next user will experience the same problem.

I've also had good luck in reproducing the problem by turning on a Youtube video in full screen mode and set up mirroring to my Apple TV – it seems to consistently freeze up within an hour.

2013 Mac Pro, 6 Core, D300 GPU, Dual 27" Thunderbolt displays.

@kotho

Did you check if the code was really activated? I also did try to set the code once and tested without result.

But when I checked the code wasn't activated. After I activated and tested the code again it seems to have worked.

I now have the screensaver test running for 3 days without a crash (normally it took max. 2 days)

I am adding this machine to my production Mac Pro's again and see what happens.

check your console. It should have ** GPU Hardware VM is enabled....

so far no gpu crashes after applying the setting. fingers cross. I had a weird auto logout once.

They have replaced one of the graphics cards. Now it all seems ok ...

Hopefully that works out for you. I've had my graphics cards replaced too. Twice.

had another gpu crash today. But its the longest i've been without a crash since the nvram setting. I probably got to take time off to get to the apple authorised dealer. No legit apple stores in singapore

"Apple is planning to launch its first outlet in Singapore in 2016, at the Knightsbridge luxury retail complex on Orchard Road."

source:

appleinsider.com

Hi All,

I can also confirm freeze's are not gone after the NVRAM setting.

I still have to check the Mac Pro with the new videocard.

I can confirm that in my case I've had no freezes after nvram settings after two weeks

But I think that are influenced also by software that I use...

Unfortunately, the MAC will not run. Similar problems. As I work I lose audio.

This MAC is unusable and it's impossible to find a solution to fix it.

It 'a nightmare and I do not know what to do

my point exactly. No legit stores here. not yet at least.

I guess the only option now is to take to the repair person. And best case scenario is the repair person understands the problem and have experience with people coming in with the nmp. Worst case maybe after test and tedious explaining the repair person is unable to see a crash and says no repair after a couple hours.

If only apple can acknowledge their gpu are faulty and call out a mass gpu replacement programme.