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Mac Pro 2006 won't display anything

1303 Views 13 Replies Latest reply: Sep 12, 2012 12:21 PM by DPArt RSS
eric_herts Calculating status...
Currently Being Moderated
May 26, 2012 4:42 PM



My mac pro won't display anything. I've had a look at this and one of the first things I did was reset the PRAM & NVRAM. The 10.6.8 install is fully updated. The startup chime plays and fans run normally.


I have:


  • re-sat the RAM,
  • cleaned the RAM
  • cleaned the inside
  • removed all the HDDs except the main one
  • and even used another Raedon 4850 in place of mine.


It starts up in Target-Disk mode fine, I am using it with my iMac now but it is not the same (iMac is only dual core andhas half the RAM) I've tried several screens; DVI, VGA and HDMI all without luck. It's obviouslt out of warranty and I don't want to take it to a Apple store anyway as I ocassionally build & repair computers myself so am fine with trying anything out.


Thanks in advance,







Things I could do/ haven't done:


  • Remove/ replace the Logic Board battery?
  • test the power I/O?
  • start in Safe Mode?
Mac Pro, Mac OS X (10.6.8), Also Bootcamp Windows 7
  • X423424X Level 6 Level 6 (14,190 points)
    Currently Being Moderated
    May 26, 2012 10:16 PM (in response to eric_herts)

    I am not sure what you are trying to do.  Do you..


    1. Connect the iMac to the mac pro and access it's drives in target disk mode?




    2. Connect the iMac to the mac pro with the intent of attempting to use the displays conencted to it.


    The reason for the weird questions is that you would only use video connections (vga, hdmi, dvi) for video and the mac pro cannot handle video input that way.  Those are only video out possibilities for the mac pro.  For target disk mode you need a data connection, e.g., using a firewire connection.


    How to use and troubleshoot FireWire target disk mode

  • The hatter Level 9 Level 9 (58,545 points)
    Currently Being Moderated
    May 27, 2012 4:18 AM (in response to eric_herts)

    There is a physical SMC reset button on MacPro1,1 (and 2,1)


    Run AHT off the OEM DVD it came with (10.4.7 original DVDs)


    FBDIMMs can easily fail - use just one set.

  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)
    Currently Being Moderated
    May 27, 2012 2:14 PM (in response to eric_herts)

    Safe Mode uses a simple display driver. [Shift at Startup], but takes several minutes to come up, and requires your password to login.


    Startup Manager [Option at Startup] uses the simplest of everything. It is all in ROM, and draws an icon for each potential boot Volume, then waits for you to decide.

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • Grant Bennet-Alder Level 8 Level 8 (48,110 points)
    Currently Being Moderated
    May 27, 2012 2:46 PM (in response to eric_herts)

    If you cannot get the Option key/Startup Manager to draw a screen you have a Hardware problem.


    Remove ALL the Hard Drives and try again, on the assumption that something on a drive is messing up your Mac.


    Are you getting a Chime?

    Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
  • DPArt Level 2 Level 2 (495 points)
    Currently Being Moderated
    Sep 12, 2012 12:21 PM (in response to eric_herts)

    Whoa there, sparky !!!


    Is there something you aren't mentioning?


    Since there has never been a Mac Pro 4850 and you have mentioned this number twice I would like to ask...what aren't you telling us?


    Did this computer work fine until one day it quit? Or did you buy/inherit/find it broken or in an unknown state?


    Any GPU used in a Mac Pro needs to have EFI on it to do this basic debugging stuff. While PC WIndows BIOS cards can be used if the system is A-OK and gets to desktop, it is basically impossible to use them on a system with issues.


    So, if the 4870 has a DVI and a MDP port it is real Apple one and SHOULD work.


    If that card died and you have tried replacing it with a WIndows/PC 4850, then you have broken the scientific rule about only changing one thing.


    Ideally you would have another Mac Pro to test your GPU in and another KNOWN GOOD GPU to test in your Mac Pro. The EFI thing greatly complicates things, unfortunately. Even a "Mac Pro" video card won't necessarily work if it is for "the other" series of Mac Pro. Ther have been in effect, 2 different Mac Pros as far as video cards go. EFI32 and EFI64. ATI/AMD cards have been largely unaffected by this but Nvidia cards MUST be for right series.


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