5 Replies Latest reply: Mar 25, 2013 5:22 PM by Dennis Kulpa
zencoud Level 1 (0 points)

I recently bought a G5 2 x 2.7 for a real cheap price (70 euros, yes its true) as the owner told me that the motherboard was bad and had the three lights problem and won´t boot


Then I started reading about this problem (micro-fracture) and tried to find a solution for it. First I tried was the "hair-dryer", it worked but as soon as the motherboard got colder then it hanged as the ram problem came back.


I was considering the "oven trick" but seemed too risky and also a lot of work to unassembly it, etc...


Then I found that there are "heat guns" and this made the miracle :-)


I bougth a heat gun for 16 euros (Leroy Merlin). It is able to heat up to 500 celsius and had two modes. I assumed the low mode may be around 200 celsius or so. Then opened the powermac, and started heating the rectangle area between the two memory banks. Slowly, moving it around, heating (not over the ram, just in the middle area). A few times I turned the max power for the heat gun as my intention was to "melt' the micro-fracture.


I am writting this post from the back-from-dead G5 :-)  working so fine, for many hours now. Don't know how long it will remain alive, but for now, its working great :-)


Need help ? You can find me at antonio.fivetech@gmail.com


Go running for the heat gun... ;-)

powermac G5, Mac OS X (10.5.8), G5 back from death
  • BDAqua Level 10 (122,202 points)

    Great work, thanks for the post!

  • japamac Level 7 (24,390 points)

    I've also resurrected a G5 board with a heat gun.

    Another area of concern, besides the memory controller BGA, are the RAM slot connections.


    If youy have issues again, repeat the heatgun reflow on the RAM slot connections.

  • Kort Level 3 (810 points)

    Sorry to bring back an old thread, but I'm having the same issue. I just want to clarify how to use the heat gun before attempting this repair. Heat up the center section between the RAM slots? Should I remove the RAM before doing this? Should I heat up the RAM slots too? I was able to get my G5 running by pressing on the memory sticks during boot-up, but am not sure how long that fix will last. The past few times my computer has just suddenly frozen while running, so I think I need to try the heat gun fix.

  • Dennis Kulpa Level 1 (15 points)

    I've got a 9-year old dual 2GHz G5.  When it was 4 years old, I had a problem like this, tried the hair dryer inside that cabinet and it worked.  To keep it running, I closed up the cabinet, set the hair dryer in front of the machine blowing into the front fans.  I would do this for about 2-3 minutes and that was enough to start the computer.  To keep it running, I just left the hair dryer in front like this, on a low heat setting.  I was able to run for an entire day so that I could get a back-up of all my files before I took it in for service.  Had one of the processors replaced and it's been running fine ever since.