Mac pro 6,1 V Sync Problem

Hi!
I just bought myself a Mac Pro for editing this week but I noticed some weird behaviors.
For instance when I watch a video-video or youtube video I get terrible artifacts that looks like tearing on the horizontal axis.
So I thought for myself that there must be a setting somewhere in either os x or in the AMD Firepro D300 for v sync but I can't find anything.
Any suggestions on how I can force it?
/ Mattias

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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I have an early 2008 Mac Pro, which has re-booting problems. Also what does the spinning beach-ball indicate?

Hi, I have an early 2008 Mac Pro which has re-booting problems.
Processor speed is: 2.8
Memory: 2GB 800 MHz DDR2 FB-DIMM
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I am running OSX Yosemite Version 10.10
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When you have the beachball activity, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
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Mac pro 8 core early 2008 problem is you have to unplug

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HT3964 Mac pro 8 core early 2008 problem is you have to unplug it for 2-3hrs when you finish work so it will turn on effortlessly again

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Hello
I'm currently running Yosemite on the late 2013 Mac Pro.
I'm having major issues with Cubase 8.
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Mac Pro Late 2013
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12 GB Ram
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Greets!

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Mac Pro Restart and Hardware Test Problems

This appears to be a continuation of a thread I began titled "MacPro Restart or Reboot Problems" in which the reboot problem still seems to be evident.
Initially, I was having problems with rebooting but after rebuilding my directory with DiskWarrior, the issue disappeared. Then recently, I entered my password and the Mac restarted itself and the same problem is back where the drive seems to try and "catch" but can't.  And now its back to  happen anytime I want to re-boot (however, this tends to be rare.)
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The Mac Pro appeared to be on because the YouTube video started to play. However, the sound only came out of its internal speaker and the two monitors were not awake. I could not login at all and had to do a hard shut down by pressing the power button for a few seconds.
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Hi,
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Is the Mac Pro user less important for Apple?
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Message was edited by: Anthony Jr.

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Set-up
Mac Pro 3,1 (Early 2008)
Processor 2 x 2.8 GHz Quad-Core Intel Xeon
Memory 32 GB 667 MHz DDR2 FB-DIMM
Graphics ATI Radeon HD 5770 1024 MB
Storage 2 TB SATA Disk , 2 x 500GB SATA Disk , 128GB Solid State SATA Disk
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I've attached these screen shots too just in case...
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Try booting to Recovery and repairing the the startup disk via Disk Utility.
OS X: About OS X Recovery - Apple Support
Next try resinstalling the OS
OS X Mavericks: Reinstall OS X

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