Replacement of logicboard Mac Pro

Discussion in 'Mac Desktops' started by berazzi, Dec 6, 2017.

  1. berazzi

    berazzi New Member

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    Hi there,

    So im fairly new to the hardware of older Mac's but got my hands in a old Mac Pro 1.1 which was working fine, but definitely lacking power (it was the 2 x dual core version with only 4GB ram). So when i stumbled across some spare parts from a 3.1 I did not hesitate to buy it.
    So I took everything out, except the superdrives, harddrive, front panel board and the PSU and put in the following from the 3.1:

    - Logic board with CPU's
    - Ram risers with new dimms and 4 old dimms

    I obviously also fitted heatsinks and so on and attached the wifi antenna to the wifi card (which the 1.1 did not have).

    Now I made very sure I got all the cables right, so that should not be the problem.

    However when I try to boot it nothing happens except for the following:

    1. A VERY short click from somewhere near the front
    2. A flash from a red led somewhere in the vicinity of the Wifi card, so at the front of the logicboard. I have tried multiple times to see exactly where but I simply cannot see it because it is so fast.

    I have tried pressing the DIAG_LED when the computer having power and the only thing is that the STBY lights yellow which it as fasr as I can tell is supposed to do.

    Anyone have any ideas about what could be wrong or suggestions to what I should try? Also, if I left out any important info let me know.
     
    berazzi, Dec 6, 2017
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  2. berazzi

    Cory Cooper Moderator

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    Hello and welcome.

    The logic board isn't really a user-servicable part. Also, normally they cannot be interchanged within the various models.

    -Which exact model Mac Pro?
    -Where did you source the replacement logic board and RAM riser?
    -How did you attach the heatsinks?

    My guess is either the replacement parts are damaged, the PSU isn't strong enough for the new parts, RAM isn't installed correctly, etc.

    C
     
    Cory Cooper, Dec 9, 2017
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