Upgraded Mac Pro won't boot chime, tried several things

Discussion in 'Mac Pro' started by Ryoma Getter1, Sep 22, 2018.

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  1. Ryoma Getter1 macrumors newbie

    Ryoma Getter1

    Joined:
    Feb 3, 2018
    Location:
    Santiago, Chile
    #1
    Hi guys, I didn't feel like making a new thread but to avoid confusions seems like the best idea.

    As i mentioned in a previous post I need some help, My boss kidnly asked me if I "could bring some life to his old mac pro 1.1" with some effort and lots of reading I managed to change both cpu for quadcore' 3.0Ghz which pretty much doubled its multicore geekbench score, installed 32GB of ram, added a sata SSD and a radeon 280X, managed to build and install patched boot.efi version of El Capitan, and ran the scripts to protect it in case of "updates"

    Computer has worked fine for over 6 months, but las week he told me the computer wouldn't boot, fearing he had ****ed something up, I went there with a backup and a copy of the OS, luckily i just did a PRAM reset and the computer booted up fine, he was using it in front of me when it stopped working, video froze, completely unresponsive.

    I power cycled it and it wasn't booting, so i did a PRAM reset again, and an SMC reset which made the computer boot again, but this time after only a couple minutes it started power cycling on its own.

    now computer wont chime, at all i get the CPU A CPU B fail light, and have tried resetting everything i know.
    Removed the big ATI card, and did several combinations of no ram, dimms to see if it was a memory issue.

    i haven't had any luck with this. at this point i could take the whole thing appart, but I don't know what i'd be looking for, as i said the computer was working and died in front of me.

    Could i have corrupted the EFI or something like that?

    i don't expect an easy solution, but maybe someone's got an idea i could try.
    if you suspect that dissembling and redoing the thermal paste or something like that could fix this, i'll try it out, but kind of doubt it.
     
  2. Ryoma Getter1 thread starter macrumors newbie

    Ryoma Getter1

    Joined:
    Feb 3, 2018
    Location:
    Santiago, Chile
    #2
    Ok some updated info... i opened the mac and tried every kind of reset available to no avail , since I had CPU A and CPU B failure leds, I opened everything up checked all connections, removed the quad-cores 3.0 cpus, and installed the original 2.66 dual cores, tested before putting everything together and the leds didn't say error, ive got trckle when pressing diag with computer off, and when computer on i get led 1 for trickle power and led 7? in green i don't get boot chime, HD and fans powerup no video nothing tried several combinations of both rams raisers to no avail. any idea of what can be screwed? i didn't do a partcularly good job with the thermal paste since im just looking for a boot, before i waste a bunch. so now I can at least say ITS NOT the CPU , ITS NOT VIDEO, AND ITS NOT RAM, PSU? LOGIC BOARD? any ideas
     
  3. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #3
    The usual way to find this type of problem is to test the PSU and logic board in a working Mac Pro.

    It's very difficult to diagnose this type of problems without having working parts to replace and check what's working and what's not.
     
  4. Ryoma Getter1 thread starter macrumors newbie

    Ryoma Getter1

    Joined:
    Feb 3, 2018
    Location:
    Santiago, Chile
    #4
    thanks... i'll check around Monday if i find some enterprising service center willing to take the challenge
     

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3 September 22, 2018