[URGENT] G5 AHT gives fan error but all fans are running

Discussion in 'Mac Pro' started by xfarsightx, Oct 29, 2010.

  1. xfarsightx macrumors newbie

    Oct 29, 2010
    Hello All,

    I have a Power Mac G5 (Late 2005 - regular cooling heatsink) and its not booting up. Apple Hardware Test gives the following error:

    2FAN/4/8: CPU A INTAKE

    This is our Main Server running DHCP, DNS, AFP and Netboot. so its really critically I have it up and running.

    So far I have semi disassembled and air canned it. So no dust. All the fans are working however the fans next to the heatsink seems to run a bit slow then others.

    I have unplugged all the extra hardware (RAID Card). Have reseated the memory and have tried different memories. Did the PRAM reset.

    I am stumped. Any clue, advice or help will be appreciated.

  2. Spanky Deluxe macrumors 601

    Spanky Deluxe

    Mar 17, 2005
    London, UK
    It may just be that the sensor in the fan's not working right and so the hardware test is reporting a problem. Get iStat on it and see what fan speeds it reports. I don't know what the 'normal' fan speeds are on a G5 but someone else on here with a similar machine might be able to give you an idea.
  3. xfarsightx thread starter macrumors newbie

    Oct 29, 2010

    Thanks for the reply and apologize for my late reply.

    So after many hours of trail and error I narrowed it down to power consumption issue. I had a set of RAID drives running which seemed to cause problems. I double check the RAID card with another computer and their was no problem so it lead me to believe that the power consumption by the 3 RAID drives was the culprit.

    I don't want to plug in the RAID setup in it to be sure of the problem so I am leaving this one alone.

    I had to reinstall the MAC OS X server and pulled out the whole RAID setup and so far it has been running good.

    Didn't look further into this

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