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Thread: '04 dual 2.5 g5: red lights = no startup

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  1. #1

    Default '04 dual 2.5 g5: red lights = no startup

    My 6.5 year old G5 is only partially starting up.

    1. Power button lights and does not blink
    2. Chime sounds
    3. Fans cycle to regular speed
    4. Graphics card fan powers up
    5. USB powers up

    THEN

    1. two LEDs, one at each processor, light up RED. This is not at the RAM sockets but where the processors are located.

    That's it, and within a couple minutes the fans begin revving up.

    Keyboard doesn't have any effect (holding down "shift", or "C" to boot apple hardware test CD, or "option" to choose another boot disc).
    LCD screens remain dark.
    None of the hard drives fire up.
    Optical drive sounds like it spins up.

    I'm completely stumped and I can only find info for leds for the RAM sockets on late '05 G5's...nothing for leds for the processor chip section.

    Any help would be greatly appreciated.

  2. #2
    Join Date
    Jan 2002
    Location
    NW Montana
    Posts
    8,197

    Default

    Maybe even just disconnected everything, every cord, including power and let sit 20 minutes and try? You can try this too... it can't really hurt but could reset some defaults. How's your battery. I am not sure which "red" light you refer to but some mobo's have red lights. Someone with a G5 might know...


    Zap the PRAM. On Startup hold the (command + option + P + R) keys. Hold them until you hear the first startup "bong/chime" and keep holding them for about 3-4 more "bongs/chimes".
    ------
    Open Firmware reset -

    Hold the Command+Option+O+F keys during startup. This will put you in the Open Firmware Interface. At the end of any text you will get a '>' prompt. At that prompt type:

    reset-nvram -Hit Return
    set-defaults -Hit Return
    reset-all -Hit Return

    That should cause a reboot.

    Apple info and instructions for the same

  3. #3

    Default

    Tried letting sit, nothing plugged in
    Checked battery = nearly 3.7 volts
    Started with and without battery

    It doesn't go far enough into boot for the keyboard to even work. I think I said the keyboard didn't work. Changing keyboards has no effect.

    This is ALL about those two red lights at the processors. Wish I knew what they were "indicating" I read somewhere it was a processor "hang" but that doesn't sound right. Logically, I'd have those processor lights light up if it overheated, was damaged, or if some process was shutting down the processor to protect it.

    Quote Originally Posted by rwm View Post
    Maybe even just disconnected everything, every cord, including power and let sit 20 minutes and try? You can try this too... it can't really hurt but could reset some defaults. How's your battery. I am not sure which "red" light you refer to but some mobo's have red lights. Someone with a G5 might know...


    Zap the PRAM. On Startup hold the (command + option + P + R) keys. Hold them until you hear the first startup "bong/chime" and keep holding them for about 3-4 more "bongs/chimes".
    ------
    Open Firmware reset -

    Hold the Command+Option+O+F keys during startup. This will put you in the Open Firmware Interface. At the end of any text you will get a '>' prompt. At that prompt type:

    reset-nvram -Hit Return
    set-defaults -Hit Return
    reset-all -Hit Return

    That should cause a reboot.

    Apple info and instructions for the same

  4. #4
    Join Date
    Jan 2002
    Location
    NW Montana
    Posts
    8,197

    Default opps, let's see more thoughts

    You are getting a chime .... but no keyboard response before or after power on. I don't think I've had that ever happen. okay, I have limited G5 smarts if it is a G5 issue... Calling fer some G5 help. Could be a lot.

    Does not sound like RAM, But you could remove some.

  5. #5
    Join Date
    Aug 2001
    Location
    Grangeville, ID USA
    Posts
    9,142

    Default

    Need to know which model you have. I may have a Service Manual around for it, but need to know exactly which model it is. You might download MacTracker and see if you can ferret out which model identifier - PowerMacG5x,x - that is what will let me figure out if I have the manual.

    Rick
    molṑn labe'
    "I am a mortal enemy to arbitrary government and unlimited power. I am naturally very jealous for the rights and liberties of my country, and the least encroachment of those invaluable privileges is apt to make my blood boil."
--Ben Franklin

  6. #6

    Default

    Rick to the rescue!! You guys are the best!
    16 years without a single significant mac problem and now my mac bubble has burst.

    Downloading now.
    Quote Originally Posted by ricks View Post
    Need to know which model you have. I may have a Service Manual around for it, but need to know exactly which model it is. You might download MacTracker and see if you can ferret out which model identifier - PowerMacG5x,x - that is what will let me figure out if I have the manual.

    Rick

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