Power Supply Fan Always Runs Full Throttle - Mac Pro (Early 2008)

My Mac Pro has been almost flawless since I purchased it new in February 2008. I did not purchase the AppleCare because I rather naively assumed at the time that my shiny new Mac Pro was an invincible machine. (I was seduced by Apple after all!) Well, that was when I was younger (about 2.5 years ago) and before I knew about the actual cost of things like Logic Boards and Apple Power Supplies... Now the $250 AppleCare lifeline seems like a bargain!
The Problem:
1 week after installing Windows 7 64-bit to a separate internal hard drive using boot camp 3.1, my Mac Pro was playing music from the local iTunes library in Snow Leopard when the power supply fan revved up to 2760 rpm! I immediately tried rebooting the machine, resetting the PRAM and SMC several times, but the fans continue to throttle up to almost 2800 rpm within seconds of powering on the Mac.
I have run the Apple Hardware Test several times and every time it generates the same error code within 1 loop of either the extended or regular test:
4SNS/1/40000001: lp0C-0.000
An Apple Support technician was kind enough to "sneak" me a little bit of information about the error code. He told me the message is Logic Board Sensor related and could be caused by a faulty Logic Board, Sensor Board (Ambient Board?), Power Supply or possibly a faulty sensor that might be repairable.
Emotion:
Other than my 6 month old daughter eyeing the Mac Pro with the same suspicion she reserves for the Dyson vacuum cleaner, the computer still works fine--it hasn’t crashed in either Windows 7 64-bit or Snow Leopard and I haven’t noticed any unusual behavior. I had one other problem with this computer about 1 year ago when I installed Vista using boot camp. About a week after the Vista install, the OEM ATI HD 2600 XT completely died and I replaced it with a GTX 285.
I have grown a little suspicious about the efficiency of boot camp in the Windows environment, but perhaps the 2 separate boot camp installs and subsequent hardware failures are coincidence or related to the hardware issue I am yet to resolve...?
Hopefully, someone in the Apple community will offer guidance to a swift and economical solution!
Thank you in advance for your time.
Some Data:
iStat Pro Info
CPU
User: 0%
Nice: 0%
Sys: 0%
Idle: 100%
TEMPs (in Fahrenheit) - There was no entry for Power Supply Temp in iStat!
HD1: 90
HD2: 90
HD3: 92
HD4: 92
CPUA: 88
CPUA: 86
CPUB: 88
CPUB: 86
Ambient: 76
Expansion Slots: 94
HD Bay1: 83
HD Bay2: 83
HD Bay3: 83
Hd Bay4: 81
Mem Bank A1: 106
Mem Bank A2: 99
Mem Bank A3: 99
Mem Bank B1: 92
Mem Bank B2: 92
Mem Bank B3: 94
Mem Module A1: 130
Mem Module A2: 126
Northbridge: 106
FAN SPEED (rpm)
Power Supply: 2760
Exhaust: 600
CPU Fan: 500
HD/Expansion: 800
Hardware Overview
Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 2 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4

I had the same problem. The solution was replacing the Power Supply.
Because i had Apple Care there where no costs.

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      Speed: Empty
      Status: Empty
      Manufacturer: Empty
      Part Number: Empty
      Serial Number: Empty
    DIMM Riser A/DIMM 3:
      Size: 1 GB
      Type: DDR2 FB-DIMM
      Speed: 667 MHz
      Status: OK
      Manufacturer: 0x80AD
      Part Number: 0x48594D5035313241373243503844332D5335
      Serial Number: 0x01172313
    DIMM Riser A/DIMM 4:
      Size: 1 GB
      Type: DDR2 FB-DIMM
      Speed: 667 MHz
      Status: OK
      Manufacturer: 0x80AD
      Part Number: 0x48594D5035313241373243503844332D5335
      Serial Number: 0x01172714
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Negotiated Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported
    WDC WD5000AAKS-00A7B0:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: WDC WD5000AAKS-00A7B0                 
      Revision: 01.03B01
      Serial Number:     WD-WMASY0158891
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk2
      Medium Type: Rotational
      Bay Name: Bay 1
      Partition Map Type: GPT (GUID Partition Table)
      S.M.A.R.T. status: Verified
      Volumes:
    disk2s1:
      Capacity: 209.7 MB (209,715,200 bytes)
      BSD Name: disk2s1
      Content: EFI
    HD:
      Capacity: 499.25 GB (499,248,103,424 bytes)
      Available: 484.82 GB (484,820,348,928 bytes)
      Writable: Yes
      File System: Journaled HFS+
      BSD Name: disk2s2
      Mount Point: /Volumes/HD
      Content: Apple_HFS
    Recovery HD:
      Capacity: 650 MB (650,002,432 bytes)
      BSD Name: disk2s3
      Content: Apple_Boot
    WDC WD5000AAKS-00A7B0:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: WDC WD5000AAKS-00A7B0                 
      Revision: 01.03B01
      Serial Number:     WD-WMASY0158891
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk2
      Medium Type: Rotational
      Bay Name: Bay 1
      Partition Map Type: GPT (GUID Partition Table)
      S.M.A.R.T. status: Verified
      Volumes:
    disk2s1:
      Capacity: 209.7 MB (209,715,200 bytes)
      BSD Name: disk2s1
      Content: EFI
    HD:
      Capacity: 499.25 GB (499,248,103,424 bytes)
      Available: 484.82 GB (484,820,348,928 bytes)
      Writable: Yes
      File System: Journaled HFS+
      BSD Name: disk2s2
      Mount Point: /Volumes/HD
      Content: Apple_HFS
    Recovery HD:
      Capacity: 650 MB (650,002,432 bytes)
      BSD Name: disk2s3
      Content: Apple_Boot
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Negotiated Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported
    HDS725050KLA360:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: HDS725050KLA360                       
      Revision: K2AOAB5A
      Serial Number:       KRVN67ZBHBEEAH
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk1
      Medium Type: Rotational
      Bay Name: Bay 2
      Partition Map Type: MBR (Master Boot Record)
      S.M.A.R.T. status: Verified
      Volumes:
    UNTITLED 1:
      Capacity: 500.11 GB (500,107,860,992 bytes)
      Available: 449.41 GB (449,412,988,928 bytes)
      Writable: Yes
      File System: MS-DOS FAT32
      BSD Name: disk1s1
      Mount Point: /Volumes/UNTITLED 1
      Content: DOS_FAT_32
    HDS725050KLA360:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: HDS725050KLA360                       
      Revision: K2AOAB5A
      Serial Number:       KRVN67ZBHBEEAH
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk1
      Medium Type: Rotational
      Bay Name: Bay 2
      Partition Map Type: MBR (Master Boot Record)
      S.M.A.R.T. status: Verified
      Volumes:
    UNTITLED 1:
      Capacity: 500.11 GB (500,107,860,992 bytes)
      Available: 449.41 GB (449,412,988,928 bytes)
      Writable: Yes
      File System: MS-DOS FAT32
      BSD Name: disk1s1
      Mount Point: /Volumes/UNTITLED 1
      Content: DOS_FAT_32
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Negotiated Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported
    HDS725050KLA360:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: HDS725050KLA360                       
      Revision: K2AOAB5A
      Serial Number:       KRVN67ZAK1RKSF
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk0
      Medium Type: Rotational
      Bay Name: Bay 3
      Partition Map Type: GPT (GUID Partition Table)
      S.M.A.R.T. status: Verified
      Volumes:
    disk0s1:
      Capacity: 209.7 MB (209,715,200 bytes)
      BSD Name: disk0s1
      Content: EFI
    machd:
      Capacity: 499.25 GB (499,248,103,424 bytes)
      Available: 372.42 GB (372,419,407,872 bytes)
      Writable: Yes
      File System: Journaled HFS+
      BSD Name: disk0s2
      Mount Point: /
      Content: Apple_HFS
    Recovery HD:
      Capacity: 650 MB (650,002,432 bytes)
      BSD Name: disk0s3
      Content: Apple_Boot
    HDS725050KLA360:
      Capacity: 500.11 GB (500,107,862,016 bytes)
      Model: HDS725050KLA360                       
      Revision: K2AOAB5A
      Serial Number:       KRVN67ZAK1RKSF
      Native Command Queuing: Yes
      Queue Depth: 32
      Removable Media: No
      Detachable Drive: No
      BSD Name: disk0
      Medium Type: Rotational
      Bay Name: Bay 3
      Partition Map Type: GPT (GUID Partition Table)
      S.M.A.R.T. status: Verified
      Volumes:
    disk0s1:
      Capacity: 209.7 MB (209,715,200 bytes)
      BSD Name: disk0s1
      Content: EFI
    machd:
      Capacity: 499.25 GB (499,248,103,424 bytes)
      Available: 372.42 GB (372,419,407,872 bytes)
      Writable: Yes
      File System: Journaled HFS+
      BSD Name: disk0s2
      Mount Point: /
      Content: Apple_HFS
    Recovery HD:
      Capacity: 650 MB (650,002,432 bytes)
      BSD Name: disk0s3
      Content: Apple_Boot
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported
    Intel ESB2 AHCI:
      Vendor: Intel
      Product: ESB2 AHCI
      Link Speed: 3 Gigabit
      Description: AHCI Version 1.10 Supported

    Try this:
    clone your system and repair it with Disk Warrior instead
    Or try a clean test system install on another drive
    A must: SmcFanControl 2.2 - a mere 400 rpm extra to keep air cooling up
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    Run AHT off your OEM DVD.
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    TimeMachine has its own bad habits, especially with Green drives and some externals.
    Try to rule out everything and then add back one at a time.
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  • Hello. My mac pro early 2008 restarts after sleep mode and it works slower. I tested it with apple hardwear test and it seems to be ok. Thank you.

    Hello. My mac pro early 2008 restarts after sleep mode and it works slower. I tested it with apple hardwear test and it seems to be ok. Thank you.

    Try this:
    clone your system and repair it with Disk Warrior instead
    Or try a clean test system install on another drive
    A must: SmcFanControl 2.2 - a mere 400 rpm extra to keep air cooling up
    Try to run w/o externals. MyBook included.
    Is that a 7200.11 1TB? they had a lot of issues.
    Run AHT off your OEM DVD.
    2008 had to have EFI and SMC updates to deal with freezes on wake from sleep, and like all models, high inrush current.  Hopefully you have a UPS and is 1500VA unit.
    When you do hard restart from power button, you almost certainly add more directory errors and to files requiring immediate attention to repair and rebuild the directory; and to scan and repair and delete cache and temp files and folders. A must. Invest in bootable backups SuperDuper along with Disk Warrior (or TechTool Pro 6, maybe Drive Genius 3 but I'd rate that #3).
    TimeMachine has its own bad habits, especially with Green drives and some externals.
    Try to rule out everything and then add back one at a time.
    And it may just be time to replace the 8800, very common, a couple threads this week, and it is 3 yrs old.  Might want ATI 5870 or 5770.

  • Mac Pro (Early 2008) shuts down unexpectedly

    I have a recurring problem with my Mac Pro (Early 2008). I put the computer to sleep; then, when I tap a few keys on the keyboard to wake it up, I hear the start-up sound and it boots up as if it were shut down.
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    I've noticed the same problem for one day with my new MP 2.8 dualquad, got a reboot after every sleep.
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  • Mac Pro Early 2008 Crash on Boot Up

    I have a Mac Pro early 2008 running OSX 10.8.5, and yesterday morning for seemingly no reason I had a screen corruption and freeze up, a kernel panic and then it rebooted itself. I have tried all of the memory( no flashing LED over power switch), cleared and reset all of the PRAM via keyboard and motherboard etc etc and everytime I reboot it crashes at the same point with a screen corruption and reboot. When I tried to boot in safe mode it the bar got 50% of the way across and it rebooted. I booted in verbose mode and single user mode and on both the last entry related to 'Ambrosiaaudiosupport' (as best I can remember) before it rebooted itself again. I sent the Kernel Panic to Apple but as I cannot get back into the OS I cannot obtain another.
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    Alan

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  • Disappearing HDD content / Mac Pro early 2008

    Hi,
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    Maciek
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    Hi,
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    Maciek

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    Hi BDAqua
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