Graphics card or PSU or Mother board?

Discussion in 'Mac Pro' started by ColdCase, Aug 3, 2012.

  1. ColdCase macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #1
    I have a rev B (Jan 2008) Mac Pro

    Two 2.8GHz Quad-Core Intel Xeo
    ~16GB RAM
    NVIDIA GeForce 8800 GT 512MB
    4x 750GB 7200-rpm Serial ATA
    One 256 GB SSD in optical drive bay
    One 16x SuperDrive
    AirPort Extreme Card (Wi-Fi)
    eSATA adapter card
    USB adapter card

    After years of trouble free use, I started getting random shut downs.

    I am now getting screen flickers and video artifacts (as if the screen is a square piece jigsaw puzzle with mixed up pieces) and other strange behavior and color aberations. I have been able to reboot and operate normally for hours but the display problems sometimes start on cold boot now.

    I opened up the cover and found very little dust, but vacuumed anyway.

    There are no red fault lights anywhere I can see.

    Wiggling the display connector or switching display ports sometimes improves but does not eliminate video artifacts.

    Before I start replacing parts, does this sound most likely a video card issue or a power supply problem?

    I did a search and uncovered a bunch of useful information, but the video card problems all seemed to be blank screens.

    I have been using Macs since the 80s, but this MacPro has been so trouble free that I haven't been keeping track of the common issues.

    Thanks

    Oh its at OS 10.6.8
     
  2. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #2
    The artifacting hints at GPU, any glitches of that sort more or less are. And the 8800 wasn't exactly the most stable of cards!!

    The random shut downs though... Could be PSU OR motherboard!!

    Do you have another GPU to test with? I'm guessing not :(
     
  3. MacVidCards Suspended

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #3
    try safe boot

    if it clears up artifacts then it is mos likely 8800GT

    preheat oven to 425F and google "bake nvidia 8800"

    you will need a small phillips to remove fan
     
  4. ColdCase, Aug 3, 2012
    Last edited: Aug 3, 2012

    ColdCase thread starter macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #4
    I forgot to mention that I did try safe boot and artifacts remained (screen is fine for a few minutes but slowly degrades). I also ran disk repair/repair permissions on all the drives.


    I really don't have any spare parts about.

    Oh and some of those baking posts look similar to some of the artifacts I was seeing.
     
  5. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #5
    Then it seems quite likely that the GPU is the cause of the issues..
     
  6. ColdCase thread starter macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #6
    Solved

    Just to close out this thread in case others find it.

    I picked up a RADEON HD 5870 upgrade kit from Apple and the machine is now happy. No random shut down, no random disk activity, and no video artifacts.

    I know the card is overpriced from Apple, but better with education store discounts and there is no fuss. I didn't want to deal with one of my video or graphics application not dealing well with a flashed graphics card. The 5870 just works, hopefully for awhile.

    I'm going to try baking the faulty 8800 at some point.
     
  7. chiefroastbeef macrumors 6502a

    Joined:
    May 26, 2008
    Location:
    Dallas, Texas/ Hong Kong
    #7
    Glad to hear! Please update us on your gpu baking experience.
     

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