Mac Pro increasingly frequent screen freezes / crashes

Hi,
Freezes on my MacPro are becomming increasingly frequent - I need to work out what the problem is as it's making the machine unusable. If anyone is having similar problems or has found a fix, please post here.
The issue that I am seeing is that suddenly the keyboard and mouse stop responding and the screen freezes. At first it's as if I've lost sight of the mouse pointer since the screen looks OK, but then I notice the keyboard has stopped working too. The little clock in the corner of the screen stops updating. It's not possible to quit or force quit anything. It sounds like the hard drives are doing something. I am able to SSH in to the machine while hung but not able to reboot it or shut it down (it just errors).
The only thing that enables me to recover my machine is to press and hold the power button for about 10secs until it powers off. Then I can power it up again and it works fine. If I run disk utility after reboot it doesn't find any issues.
I've not been able to find any link between the software I'm running - it just happened this evening about 7 minutes after booting when iTunes was the only open application.
It's a 2.8Ghz dual quad core pro with the 8800, 10G RAM, 4 drives, bluetooth keyboard and a wireless logitech mouse. I just put new batteries in the keyboard, have had 3 more crashes since. It has Airport but it is switched off. The only things plugged in to the USB / Firewire are an ACD monitor, an APC UPS and the reciver for the USB Mouse. All of it has been working fine with no hardware changes since delivery (for about 6-7 months). The only thing I've changed on the hardware in the last 6 months is I added a 4th drive last week, but the crashes had started before then. I'm running 10.5.4. Apart from this issue it's a fantastic machine, but with this issue it's like having a ferrari that stalls every few hundred yards.
is anyone else having similar crashes? If so, please post details of spec of machine and sofware / hardware in use when it happens so that we can try and work out what is causing them and fix it.
many thanks,
Rog.

Run Disk Warrior. Don't just restart and use the verify option in Disk Utility, boot from another drive.
RAM. USB devices. almost anything should be suspect.
Try setting up an emergency boot drive. OS X doesn't repair itself all that well, Disk Utility doesn't find as many errors, or fix, as 3rd party tools.
I would delete extensions.mkext and caches folders (not home caches), turn off journaling before repair, then turn on after. And run all the tests in Disk Warrior or other program, not just directory rebuild, scan all the files too.

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Hi All,
I have a open case with Apple as well on this but i can not seem to locate any information on this issue on the web at all.
Case: 601052633
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Bottom line: In my case I have pretty much proved this was a problem with the AMD FirePro D300 video card/s. They basically can't cope with Windows graphics needs.
I have a new Mac with D500 cards, and now the problem is almost completely gone. I can recreate if i run certain situations and a screen saver. Upon refresh, there is a chance the card will crash, but showing a slightly different outcome.
Having read the prior posts, the D700 may also have the same issue??
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This wonderful Manager at the store agreed that he wanted to take the hardware out of the equation and see if I still had the issue. So he, amazingly, agreed to refund in full for the machine and I could order a new one.
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
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*** Panic Report ***
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0xffffff80ebdfb9f0 : 0xffffff801adff683
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0xffffff80ebdfbb70 : 0xffffff801ae065e5
0xffffff80ebdfbbd0 : 0xffffff801adb6b4a
0xffffff80ebdfbce0 : 0xffffff801adacd2c
0xffffff80ebdfbd10 : 0xffffff801ada9013
0xffffff80ebdfbd40 : 0xffffff801b279eb0
0xffffff80ebdfbd60 : 0xffffff801b2fe8e3
0xffffff80ebdfbdc0 : 0xffffff801ade8e54
0xffffff80ebdfbe10 : 0xffffff801ad3e91c
0xffffff80ebdfbe40 : 0xffffff801ad235a3
0xffffff80ebdfbe90 : 0xffffff801ad33e8d
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com.apple.driver.AppleSMBusController 1.0.13d1
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com.apple.kext.OSvKernDSPLib 1.15
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOAcceleratorFamily2 156.4
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10
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com.apple.driver.AppleHDAController 266.5
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com.apple.iokit.IOAudioFamily 200.6
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com.apple.iokit.IOFireWireFamily 4.5.6
com.apple.iokit.IOUSBFamily 705.4.14
com.apple.driver.AppleEFINVRAM 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 389.1
com.apple.iokit.IOStorageFamily 2.0
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 3.1
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
com.apple.kec.Libm 1
com.apple.kec.pthread 1
Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 2.8 GHz, 6 GB, SMC 1.25f4
Graphics: ATI Radeon HD 5770, ATI Radeon HD 5770, PCIe, 1024 MB
Memory Module: DIMM Riser B/DIMM 1, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x31384832353637324A445A38304547314436
Memory Module: DIMM Riser B/DIMM 2, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x31384832353637324A445A38304547314436
Memory Module: DIMM Riser A/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x830B, 0x4E543147543732553839443642442D414320
Memory Module: DIMM Riser A/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x830B, 0x4E543147543732553839443642442D414320
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x88), Broadcom BCM43xx 1.0 (5.10.131.36.16)
Bluetooth: Version 4.3.0f10 14890, 3 services, 26 devices, 1 incoming serial ports
Network Service: Ethernet 2, Ethernet, en1
PCI Card: ATI Radeon HD 5770, Display Controller, Slot-2
PCI Card: ATI Radeon HD 5770, ATY,HoolockParent, Slot-2
PCI Card: pci1033,194, USB eXtensible Host Controller, Slot-4
Serial ATA Device: ST2000DM001-9YN164, 2 TB
Serial ATA Device: Hitachi HDS722020ALA330, 2 TB
Serial ATA Device: WDC WD20EARS-00J2GB0, 2 TB
Serial ATA Device: WDC WD20EARS-00MVWB0, 2 TB
Parallel ATA Device: PIONEER DVD-RW DVR-112D
USB Device: ImageMate 14 in 1 Reader/Writer
USB Device: USB Hub
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: Bose USB Audio
USB Device: Bluetooth USB Host Controller
FireWire Device: built-in_hub, Up to 800 Mb/sec
Thunderbolt Bus:

PCI Card: ATI Radeon HD 5770, Display Controller, Slot-2
PCI Card: ATI Radeon HD 5770, ATY,HoolockParent, Slot-2
Put your ATI Radeon HD5770 in PCIe Slot-1 and you will get much better Performance!
Solt-2 is PCIe 1x     and      Slot-1 is PCIe 16x      …

Mac pro problems with screen

my mac pro got problems with the screen it loocs like too many square and vertical lines also it dosen't start recently i just change the hard drive an when I tried to instal the sistem operative it just started those problems can someone help me what can i do?

Which Mac? what year, what model, what speed, what size screen e.g., 2006 MacBook Pro 5,1 2.95GHz 13" screen
What graphics card, if you know it.
What version of Mac OS X, e.g., 10.5.5?

Mac pro with 6 screens. 2 constantly flicker

This is a brand new late 2013 mac pro i just brought home from the apple store.
I've plugged in my 6 Dell U2312hm 1080p screens with DP to Mini DP and 2 of them keep on flickering.
Sometimes it's very fast like 6 times in 2 seconds, and some times its 2 seconds. I'm using the latest mavericks.
So far, unimpressed with this purchase, please help me fix it!

OH! You're using ALL 6 TB ports!?!? WOW!!
Can you determine which BUS is flickering?
Can you see them in the displays prefs? Check the BUS that they're on and also refresh rate if selectable. Heck cycle through 90°, 270° etc. etc. just to see if you can get them working.
I've got a Wacom Cintiq 21UX on a Rocketfish MDP –> DVI-I adapter. I see Apple Logo on boot, but then "NO SYNC"...

Mac Pro increasingly frequent screen freezes / crashes

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