G4 Power Mac (MDD) - has trouble booting after shutdown

I have a Power Mac G4 MDD (1.25Ghz) that is having issues when it is shut down. The power button on the front of the machine does not start the computer every time. Sometimes it works, sometimes I need to wait a while before it will work. When the button is pressed, it does not light up or anything.
I have noticed that if I sleep the computer it always seems to wakeup when the front button is pressed. But if I shut down the G4, is does not always bootup.
I have also performed multiple restarts when performing software updates, and they always seemed to work fine.
I have changed the Saft battery inside - it was at about .4v
I have performed a CUDA/PMU reset using the button on the motherboard, and followed the Apple procedure. (disconnect power, and accesories, press reset button, wait 10 seconds, reconnect, restart) It did not restart right away, had to wait 20 minutes or so.
The G4 has a new installation of Tiger, with all of the updates.
I have identified that the PSU is dropping the standby voltage on Pin 1. It does not do it consistently, but when the 25v is missing from Pin 1, the G4 does not start. After a couple of minutes, I can see the voltage return to Pin 1, and the unit starts no problem.
Before I look for a replacement PSU (which seem pretty expensive), I was wondering if anyone knows if this is purely a PSU issue, or does the CUDA/PMU influence the standby voltages?

With the "sometimes" nature of the problem, it could be the front panel board, a much cheaper replacement than a PSU. An Apple tech told me that one way to test the front panel board was to find one of the first Apple USB keyboards for the original iMac. The early ones have a power button like the old ADB boards that overrides the internal board/button. He said that, should the Mac start reliably from the old keyboard, then there is trouble with the front panel board. The Apple model number for the USB board with power button is M2452.
Very helpful forum member japamac has a test procedure for the MDD PSU on his site here:
http://jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C0461 9.html
You'll need a multimeter to check the voltage levels.

Similar Messages

  • Power Mac G4 MDD - Has difficulty booting after shut down

    I have a Power Mac G4 MDD (1.25Ghz) that is having issues when it is shut down. The power button on the front of the machine does not start the computer every time. Sometimes it works, sometimes I need to wait a while before it will work. When the button is pressed, it does not light up or anything.
    I have noticed that if I sleep the computer it always seems to wakeup when the front button is pressed. But if I shut down the G4, is does not always bootup.
    I have also performed multiple restarts when performing software updates, and they always seemed to work fine.
    I have changed the Saft battery inside - it was at about .4v
    I have performed a CUDA/PMU reset using the button on the motherboard, and followed the Apple procedure. (disconnect power, and accesories, press reset button, wait 10 seconds, reconnect, restart) It did not restart right away, had to wait 20 minutes or so.
    The G4 has a new installation of Tiger, with all of the updates.
    I have not checked the PSU, but plan on doing that soon. Just seems odd that it only has issues when the machine was shutdown. Seems to start after it sits for a while, but last night I was switching monitors, and shut it down, switched monitors, and it would not re-boot.
    Any ideas?

    With the "sometimes" nature of the problem, it could be the front panel board, a much cheaper replacement than a PSU. An Apple tech told me that one way to test the front panel board was to find one of the first Apple USB keyboards for the original iMac. The early ones have a power button like the old ADB boards that overrides the internal board/button. He said that, should the Mac start reliably from the old keyboard, then there is trouble with the front panel board. The Apple model number for the USB board with power button is M2452.
    Very helpful forum member japamac has a test procedure for the MDD PSU on his site here:
    http://jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C0461 9.html
    You'll need a multimeter to check the voltage levels.

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          Machine Name: Power Mac G4
          Machine Model: PowerMac3,6
          CPU Type: PowerPC G4  (3.3)
          Number Of CPUs: 2
          CPU Speed: 1.42 GHz
          L2 Cache (per CPU): 256 KB
          L3 Cache (per CPU): 2 MB
          Memory: 2 GB
          Bus Speed: 167 MHz
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          Serial Number: XB3101EMN1Y
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        Internal Modem:
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          Hardware: Modem
          BSD Device Name: modem
          IPv4:
              Configuration Method: PPP
          IPv6:
              Configuration Method: Automatic
          Proxies:
              Proxy Configuration Method: Manual
              ExcludeSimpleHostnames: 0
              FTP Passive Mode: Yes
              Auto Discovery Enabled: No
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          Type: Ethernet
          Hardware: Ethernet
          BSD Device Name: en0
          IPv4:
              Configuration Method: DHCP
          IPv6:
              Configuration Method: Automatic
          Proxies:
              FTP Proxy Enabled: No
              FTP Passive Mode: Yes
              Gopher Proxy Enabled: No
              HTTP Proxy Enabled: No
              HTTPS Proxy Enabled: No
              RTSP Proxy Enabled: No
              SOCKS Proxy Enabled: No
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              Media Options:
              Media Subtype: none
        Built-in FireWire:
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          Hardware: FireWire
          BSD Device Name: fw0
          IPv4:
              Configuration Method: DHCP
          IPv6:
              Configuration Method: Automatic
          Proxies:
              Proxy Configuration Method: Manual
              ExcludeSimpleHostnames: 0
              FTP Passive Mode: Yes
              Auto Discovery Enabled: No
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              MAC Address: 00:0a:95:ff:fe:9c:64:40
              Media Options: Full Duplex
              Media Subtype: autoselect
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          IPv4 Addresses: 192.168.1.134
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              Addresses: 192.168.1.134
              Configuration Method: DHCP
              Interface Name: en1
              Router: 192.168.1.1
              Subnet Masks: 255.255.255.0
          IPv6:
              Configuration Method: Automatic
          DNS:
              Domain Name: hsd1.fl.comcast.net
              Server Addresses: 192.168.1.1
          DHCP Server Responses:
              Domain Name: hsd1.fl.comcast.net
              Domain Name Servers: 192.168.1.1
              Lease Duration (seconds): 0
              DHCP Message Type: 0x05
              Routers: 192.168.1.1
              Server Identifier: 192.168.1.1
              Subnet Mask: 255.255.255.0
          Proxies:
              Proxy Configuration Method: Manual
              ExcludeSimpleHostnames: 0
              FTP Passive Mode: Yes
              Auto Discovery Enabled: No
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              MAC Address: 00:0d:93:ef:b8:69
              Media Options:
              Media Subtype: autoselect
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          System Version: Mac OS X 10.4.11 (8S165)
          Kernel Version: Darwin 8.11.0
          Boot Volume: Macintosh HD
          Computer Name: Jonathan Alfonso’s Power Mac G4
          User Name: Jonathan Alfonso (alfonsojon)
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        ATA Bus:
            MAXTOR STM3500630A:
              Capacity: 465.76 GB
              Model: MAXTOR STM3500630A
              Revision: 3.AAE
              Serial Number: 9QG5RHPR
              Removable Media: No
              Detachable Drive: No
              BSD Name: disk0
              Protocol: ATA
              Unit Number: 0
              Socket Type: Internal
              OS9 Drivers: No
              S.M.A.R.T. status: Verified
              Volumes:
                Macintosh HD:
                  Capacity: 465.64 GB
                  Available: 458.51 GB
                  Writable: Yes
                  File System: Journaled HFS+
                  BSD Name: disk0s3
                  Mount Point: /
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              Capacity: 186.31 GB
              Model: ST3200822A
              Revision: 3.01
              Serial Number: 3LJ078AZ
              Removable Media: No
              Detachable Drive: No
              BSD Name: disk1
              Protocol: ATA
              Unit Number: 1
              Socket Type: Internal
              OS9 Drivers: No
              S.M.A.R.T. status: Not Supported
              Volumes:
                Time Machine:
                  Capacity: 185.99 GB
                  Available: 136.84 GB
                  Writable: Yes
                  File System: Journaled HFS+
                  BSD Name: disk1s2
                  Mount Point: /Volumes/Time Machine
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            PIONEER DVD-RW  DVR-105:
              Capacity: 2.64 GB
              Model: PIONEER DVD-RW  DVR-105
              Revision: A506
              Serial Number: BLDL034723WL
              Removable Media: Yes
              Detachable Drive: No
              BSD Name: disk2
              Protocol: ATAPI
              Unit Number: 0
              Socket Type: Internal
              OS9 Drivers: No
              S.M.A.R.T. status: Not Supported
              Volumes:
                Mac OS X Install DVD:
                  Capacity: 2.64 GB
                  Available: 110.27 MB
                  Media Type: DVD-R
                  Writable: No
                  File System: HFS+
                  BSD Name: disk2s2
                  Mount Point: /Volumes/Mac OS X Install DVD
    Audio (Built In):
        Built In Sound Card:
          CODEC: Texas Instruments TAS3004
          Sample Rate: 44.1 KHz
          Number of Inputs: 1
          Number of Outputs: 4
          Devices:
            Input:
              Type: Line Level Input
            Output:
              Type: Headphones
            Output:
              Type: Internal Speaker
            Output:
              Type: External Speaker
            Output:
              Type: Line Level Output
    Diagnostics:
        Power On Self-Test:
          Last Run: 12/22/13 12:51 PM
          Result: Passed
    Disc Burning:
        PIONEER DVD-RW  DVR-105:
          Firmware Revision: A506
          Interconnect: ATAPI
          Burn Support: Yes (Apple Shipped/Supported)
          Cache: 2000 KB
          Reads DVD: Yes
          CD-Write: -R, -RW
          DVD-Write: -R, -RW
          Burn Underrun Protection CD: Yes
          Burn Underrun Protection DVD: Yes
          Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
          Media:
              Media Type: DVD-R
              Blank: No
              Erasable: No
              Overwritable: No
              Appendable: No
    FireWire:
        FireWire Bus:
          Maximum Speed: Up to 800 Mb/sec
    Graphics/Displays:
        ATI Radeon 9000 Pro:
          Chipset Model: ATY,RV250
          Type: Display
          Bus: AGP
          Slot: SLOT-1
          VRAM (Total): 64 MB
          Vendor: ATI (0x1002)
          Device ID: 0x4966
          Revision ID: 0x0000
          ROM Revision: 113-99702-122
          Displays:
            Acer AL2017:
              Resolution: 1400 x 1050 @ 60 Hz
              Depth: 32-bit Color
              Core Image: Not Supported
              Main Display: Yes
              Mirror: Off
              Online: Yes
              Quartz Extreme: Supported
              Rotation: Supported
            Display:
              Status: No display connected
    Memory:
        DIMM0/J21:
          Size: 512 MB
          Type: DDR SDRAM
          Speed: PC2700U-25330
          Status: OK
        DIMM1/J22:
          Size: 512 MB
          Type: DDR SDRAM
          Speed: PC2700U-25330
          Status: OK
        DIMM2/J23:
          Size: 512 MB
          Type: DDR SDRAM
          Speed: PC2700U-25330
          Status: OK
        DIMM3/J20:
          Size: 512 MB
          Type: DDR SDRAM
          Speed: PC2700U-25330
          Status: OK
    PCI Cards:
        usb:
          Type: usb
          Bus: PCI
          Slot: SLOT-5
          Vendor ID: 0x1033
          Device ID: 0x0035
          Subsystem Vendor ID: 0x17c6
          Subsystem ID: 0x0036
          Revision ID: 0x0041
        usb:
          Type: usb
          Bus: PCI
          Slot: SLOT-5
          Vendor ID: 0x1033
          Device ID: 0x0035
          Subsystem Vendor ID: 0x17c6
          Subsystem ID: 0x0036
          Revision ID: 0x0041
        pci17c6,e1:
          Bus: PCI
          Slot: SLOT-5
          Vendor ID: 0x1033
          Device ID: 0x00e0
          Subsystem Vendor ID: 0x17c6
          Subsystem ID: 0x00e1
          Revision ID: 0x0002
    Power:
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          AC Power:
              System Sleep Timer (Minutes): 10
              Disk Sleep Timer (Minutes): 10
              Display Sleep Timer (Minutes): 10
              Sleep On Power Button: Yes
              Automatic Restart On Power Loss: Yes
              Wake On AC Change: No
              Wake On LAN: Yes
              Wake On Modem Ring: Yes
    USB:
        USB Bus:
          Host Controller Location: Built In USB
          Host Controller Driver: AppleUSBOHCI
          PCI Device ID: 0x0035
          PCI Revision ID: 0x0043
          PCI Vendor ID: 0x1033
          Bus Number: 0x3b
            Microsoft® Digital Media Pro Keyboard:
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              Bus Power (mA): 500
              Speed: Up to 1.5 Mb/sec
              Manufacturer: Microsoft
              Product ID: 0x00b0
              Vendor ID: 0x045e
        USB Bus:
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          Host Controller Driver: AppleUSBOHCI
          PCI Device ID: 0x0035
          PCI Revision ID: 0x0043
          PCI Vendor ID: 0x1033
          Bus Number: 0x1b
            Kensington USB/PS2 Wheel Mouse:
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              Bus Power (mA): 500
              Speed: Up to 1.5 Mb/sec
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              Product ID: 0x102a
              Vendor ID: 0x047d
        USB Bus:
          Host Controller Location: Expansion Slot
          Host Controller Driver: AppleUSBOHCI
          PCI Device ID: 0x0035
          PCI Revision ID: 0x0041
          PCI Vendor ID: 0x1033
          Bus Number: 0x15
        USB Bus:
          Host Controller Location: Expansion Slot
          Host Controller Driver: AppleUSBOHCI
          PCI Device ID: 0x0035
          PCI Revision ID: 0x0041
          PCI Vendor ID: 0x1033
          Bus Number: 0x35
        USB High-Speed Bus:
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          Host Controller Driver: AppleUSBEHCI
          PCI Device ID: 0x00e0
          PCI Revision ID: 0x0002
          PCI Vendor ID: 0x1033
          Bus Number: 0x55
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          Wireless Card Type: AirPort Extreme
          Wireless Card Locale: USA
          Wireless Card Firmware Version: 405.1 (3.90.34.0.p18)
          Current Wireless Network: Alfonso
          Wireless Channel: 3
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        Automatic:
          Active Location: Yes
          Services:
            Internal Modem:
              Type: PPP
              IPv4:
                  Configuration Method: PPP
              IPv6:
                  Configuration Method: Automatic
              Proxies:
                  Proxy Configuration Method: 2
                  ExcludeSimpleHostnames: 0
                  FTP Passive Mode: 1
                  Auto Discovery Enabled: 0
              PPP:
                  ACSP Enabled: 0
                  Display Terminal Window: 0
                  Redial Count: 1
                  Redial Enabled: 1
                  Redial Interval: 5
                  Use Terminal Script: 0
                  Dial On Demand: 0
                  Disconnect On Fast User Switch: 1
                  Disconnect On Idle: 1
                  Disconnect On Idle Timer: 600
                  Disconnect On Logout: 1
                  Disconnect On Sleep: 1
                  Idle Reminder: 0
                  Idle Reminder Time: 1800
                  IPCP Compression VJ: 1
                  LCP Echo Enabled: 1
                  LCP Echo Failure: 4
                  LCP Echo Interval: 10
                  Log File: /var/log/ppp.log
                  Verbose Logging: 0
            Built-in Ethernet:
              Type: Ethernet
              BSD Device Name: en0
              Hardware (MAC) Address: 00:0a:95:9c:64:40
              IPv4:
                  Configuration Method: DHCP
              IPv6:
                  Configuration Method: Automatic
              AppleTalk:
                  Configuration Method: Node
              Proxies:
                  FTP Proxy Enabled: 0
                  FTP Passive Mode: 1
                  Gopher Proxy Enabled: 0
                  HTTP Proxy Enabled: 0
                  HTTPS Proxy Enabled: 0
                  RTSP Proxy Enabled: 0
                  SOCKS Proxy Enabled: 0
            Built-in FireWire:
              Type: FireWire
              BSD Device Name: fw0
              Hardware (MAC) Address: 00:0a:95:ff:fe:9c:64:40
              IPv4:
                  Configuration Method: DHCP
              IPv6:
                  Configuration Method: Automatic
              AppleTalk:
                  Configuration Method: Node
              Proxies:
                  Proxy Configuration Method: 2
                  ExcludeSimpleHostnames: 0
                  FTP Passive Mode: 1
                  Auto Discovery Enabled: 0
            AirPort:
              Type: IEEE80211
              BSD Device Name: en1
              Hardware (MAC) Address: 00:0d:93:ef:b8:69
              IPv4:
                  Configuration Method: DHCP
              IPv6:
                  Configuration Method: Automatic
              AppleTalk:
                  Configuration Method: Node
              Proxies:
                  Proxy Configuration Method: 2
                  ExcludeSimpleHostnames: 0
                  FTP Passive Mode: 1
                  Auto Discovery Enabled: 0
              IEEE80211:
                  AllowNetCreation: 1
                  JoinMode: Automatic
                  MAC Address: 00:0d:93:ef:b8:69
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        Modem Information:
          Modem Model: Dash2
          Interface Type: USB
          Modulation: V.92
          SKU Name: UCJ
          Hardware Version: 1.0F
          Firmware Version: APPLE VERSION 2.6.6
          Driver: InternalUSBModem.kext (v2.6.6)
          Country: B5 (United States, Latin America)

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    http://atxg4.com/sawtooth.html http://atxg4.com/gige-da.html
    http://atxg4.com/quicksilver.html
    http://atxg4.com/mdd.html
    http://atxg4.com/
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    http://www.jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C 04619.html

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