1.25Ghz MDD Kernel Panic?

Discussion in 'PowerPC Macs' started by eegg0923754, Mar 28, 2012.

  1. macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #1
    Hi,
    I have 2 dual 1.25 MDDS and overclocked both to 1.5GHz. I was running one machine just fine, wasnt running the other as I hadnt gotten RAM for it yet. So I decided to switch out the 2GB RAM from one machine to other in order to test the 2nd machine that I had yet to use. It booted up very slowly in about a minute compared to 30 seconds with the 1st MDD I was using. Then OSX froze and I restarted twice. Again slow boot times and freezing. Finally got Safari open and went to a youtube video only to recieve a kernel panic. Now when i try to boot I get the bong/chime but then no video.... Some suggestions would be helpful. What could be causing this kernel panic?

    P.S
    I havent added new thermal compund to either CPU since I overclocked them (I will in the future, right now I'm just testing the machines) but I really have a hard time believing that the CPU would kernel panic without even being warm or running heavy programs.
     
  2. macrumors 6502a

    WAM2

    Joined:
    Jan 6, 2011
    Location:
    United States
    #2
    Sounds like a memory issue, reset the PRAM, if that doesnt help, reseat the memory.
     
  3. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #3
    I tried both of these, doesn't seem to be a memory issue as this same memory worked in other mdd just fine. Today again I tried to boot and got a kernel panic and then no video whatsoeve on any boot attempt after that. I swapped out the video card, but still no video. It's not the hard drive because I've tested it in another machine. I doubt its the PSU either because the machine powers up and chimes and I can hear the fans and hard drives powerup. I'm starting to think more and more that it is the CPU and it lacking thermal paste, because it only boots once and that's it...:confused:
     
  4. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #4
    Update: It was in fact the cpu, I swapped cpus on my mdds and now it works. I guess I will be needing the thermal compund to simply boot the machine or maybe the cpu is bad. It was really weird though, how I couldn't even get video off of it.
     
  5. macrumors 6502

    Joined:
    Jul 23, 2010
    #5
  6. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #6
    OP, never test OC'ed CPUs without fresh/good thermal paste, otherwise you may see how burnt G4 looks like ;)

    Bump voltage on this "bad" CPU (one step up) and it should work OK.
     
  7. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #7
    Thanks for the input, I've also gone ahead and purchased some copper heatsinks (for $30!!) that came witht he DP 1.42 for these MDDS, thye should be running much cooler now :D
     
  8. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #8
    You may want to install Chud Tools and enable Nap mode. It will lower CPU temps by few degs, especially when idle.
     
  9. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #9
    hey 666 sheep, I did as you said by bumping up the voltage, it worked for like 5 mins then it kernel panicked again. Should I bump it up one more step or is it pretty much useless now?
     
  10. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #10
    Check your solder joints, maybe one is bad -> fix it if so.
    One step up won't hurt too, however first try above and test.
     
  11. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #11
    I'm pretty sure the soldering was ok and if not it would have been the 2nd bump up in voltage from the original settings. I removed the soldering in order to make sure it was the second bump up, but the mac wont boot, I usually get a folder in the middle of the screen with the question mark and then a few seconds later finds my HDD or installation DVD. But this time all I got was a very little piece of the top of that folder and then it stopped, so I figured another kernel panic... I will try to better solder the joint again, but is it possible the CPU really is unrecoverable at this point? :( The daughter card itself looks fine, as do the processors..
     
  12. thread starter macrumors newbie

    Joined:
    Mar 15, 2012
    Location:
    Chicago, IL
    #12
    I swapped CPUs with another one I had and it worked but I still want a dedicated CPU for this machine, I've given up on this "bad cpu"

    What CPU is better for overclocking the DP1.25 or DP 1.42?
     
  13. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #13
    Try other freqs on this "bad" CPU (1.42 GHz or lower).
     

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