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  1. #1
    Power supply fan always on at 2800 rpm
    TwistyO's Avatar
    Member Since
    Sep 21, 2006
    Posts
    19
    Power supply fan always on at 2800 rpm
    OK, here's the situation. I moved to a new office and a new computer after someone left. It's a Mac Pro running 10.4.11 with Nvidia Quadro FX 4500. The Power supply fan is always running at 2800rpm from startup.
    I've reset the SMC and PRAM
    Plug directly into wall
    tried Using SMCFanControl
    Dusted it out (there was none)
    No warranty left.

    What do I do now? Please help, this thing is loud.

    PS I don't know how the person who was here before me never thought this was annoyingly loud, she had a G4 before so that might explain it. And she was partially deaf, probably because of this machine.

  2. #2
    Power supply fan always on at 2800 rpm
    TwistyO's Avatar
    Member Since
    Sep 21, 2006
    Posts
    19
    UPDATE: I seem to have stumped everyone
    Ran hardware test got error code 4M0T/1/40000003 : PS. So it's a hardware issue, but not sure what piece of hardware. Is the control for the fan, on the fan itself, or controlled on the circuit board?
    Does anyone know where to find a description of Hardware error codes? I've googled to no avail.

  3. #3
    Power supply fan always on at 2800 rpm
    deus_ex_machina's Avatar
    Member Since
    Aug 06, 2004
    Location
    Tejas
    Posts
    1,713
    Specs:
    2GHz Mac Mini 2GB RAM 160GB 10.6.2 | MDD DP 1.25GHz G4 1.5GB RAM 10.4.11 | 233MHz iMac G3 10.3.9
    According to Apple 4MOT is Fan Motors. Since you got a non-0 on the end, check to make sure the fan blades are unobstructed, that they're properly connected to the logic board.
    Can't be sure without running ASD
    solution: replace fans and retest. Still won't work, then replace the logic board.

  4. #4
    Power supply fan always on at 2800 rpm
    TwistyO's Avatar
    Member Since
    Sep 21, 2006
    Posts
    19
    I unplugged the fan and the Mac wouldn't turn on at all? weird. probably a safety issues so it won't overheat. It's definitely not obstructed, (see title). I have a feeling I'll be bringing it in to be fixed rather than purchasing items I may or may not need.

  5. #5
    Power supply fan always on at 2800 rpm
    deus_ex_machina's Avatar
    Member Since
    Aug 06, 2004
    Location
    Tejas
    Posts
    1,713
    Specs:
    2GHz Mac Mini 2GB RAM 160GB 10.6.2 | MDD DP 1.25GHz G4 1.5GB RAM 10.4.11 | 233MHz iMac G3 10.3.9
    Quote Originally Posted by TwistyO View Post
    I unplugged the fan and the Mac wouldn't turn on at all? weird. probably a safety issues so it won't overheat. It's definitely not obstructed, (see title). I have a feeling I'll be bringing it in to be fixed rather than purchasing items I may or may not need.
    The error is for your power supply fans - you disconnected those? They don't have to be totally obstructed to give an error, but with what you've said it looks like you're replaced the logic board.

    You never listed the year of your Mac Pro so I can't say how expensive it will be. Go eBay.

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