SamSLP
Level 1 (4 points)
Desktops

Q: G5 won't start. LED light on. Front fans work.

Early 2005 G5. Running 10.5.8.

 

G5 won't start. LED light on (not blinking but solid). Front fans work. Back exhaust fans not blowing. Have cleaned out dust. Went off during a power outage and won't restart. Any thoughts? Is it a bad PSU? What should I do. Thanks for any help. I love this old computer and hope to keep it fixed and working.

 

Sam

PowerMac, Mac OS X (10.5.8)

Posted on Jul 26, 2016 7:18 PM

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SamSLP

Q: G5 won't start. LED light on. Front fans work.

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  • Helpful answers

  • by K Shaffer,

    K Shaffer K Shaffer Jul 27, 2016 12:38 AM in response to SamSLP
    Level 6 (14,204 points)
    Desktops
    Jul 27, 2016 12:38 AM in response to SamSLP

    Some of the basic things include replacement of the pram/clock battery

    since they can do dead; then with power interruption, sometimes the Mac

    won't restart. Usual power management unit & NVRAM/PRAM resets are

    methods that sometimes also used as a troubleshooting measure.

     

    • Resetting the Power Management chip in your Mac: (see SMU)

    http://www.thexlab.com/faqs/resetpmchip.html

     

    • How to Reset NVRAM-PRAM on your Mac - Apple Support

     

    A hard-reset can sometimes be used, where the power supply is unplugged

    from the logic board, and power removed from grid; then push power button.

    (But maybe not. Several PowerMac computers I had, some found this helpful)

     

    You may also have to remove and re-seat the various cards and other items

    inside the case, to be sure they are connecting properly. Be careful to not

    short anything, due to static charge or residual power in the circuits.

     

    The hour is late here, so I'm going offline; hopefully a reset or new battery, etc

    can help get it going again. Also sometimes the power supply has faulty fans,

    circuits or capacitors, so they can be troublesome to repair or replace.

     

    Good luck in this matter!