Power Mac G4 not turning on after clean shutdown, works otherwise.

My Power Mac G4 does not turn back on after a clean shutdown, but turns on after being disconnected from the power. If I shut it down cleanly (Apple menu -> Shutdown), it shuts down, but then the power button does not work. After unplugging the computer and plugging it back in, the computer is able to power on successfully. I have reset the PRAM and have reseated the PSU connector.
I am using Mac OS X Tiger 10.4.11, but the same problem occurs under Mac OS X Leopard 10.5.8. I don't think the operating system really matters with this type of issue though, because the power button literally will not respond until I unplug and replug the computer.
Any suggestions?
Jonathan Alfonso’s Power Mac G4
12/22/13 2:07 PM
Hardware:
    Hardware Overview:
      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
      Boot ROM Version: 4.6.0f1
      Serial Number: XB3101EMN1Y
Network:
    Internal Modem:
      Type: PPP (PPPSerial)
      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
    Built-in Ethernet:
      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
      Ethernet:
          MAC Address: 00:0a:95:9c:64:40
          Media Options:
          Media Subtype: none
    Built-in FireWire:
      Type: FireWire
      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
      Ethernet:
          MAC Address: 00:0a:95:ff:fe:9c:64:40
          Media Options: Full Duplex
          Media Subtype: autoselect
    AirPort:
      Type: AirPort
      Hardware: AirPort
      BSD Device Name: en1
      IPv4 Addresses: 192.168.1.134
      IPv4:
          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
      Ethernet:
          MAC Address: 00:0d:93:ef:b8:69
          Media Options:
          Media Subtype: autoselect
Software:
    System Software Overview:
      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)
ATA:
    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: /
        ST3200822A:
          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
    ATA Bus:
        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:
    System Power Settings:
      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:
          Version: 1.10
          Bus Power (mA): 500
          Speed: Up to 1.5 Mb/sec
          Manufacturer: Microsoft
          Product ID: 0x00b0
          Vendor ID: 0x045e
    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: 0x1b
        Kensington USB/PS2 Wheel Mouse:
          Version: 1.00
          Bus Power (mA): 500
          Speed: Up to 1.5 Mb/sec
          Manufacturer: Kensington
          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:
      Host Controller Location: Expansion Slot
      Host Controller Driver: AppleUSBEHCI
      PCI Device ID: 0x00e0
      PCI Revision ID: 0x0002
      PCI Vendor ID: 0x1033
      Bus Number: 0x55
AirPort Card:
    AirPort Card Information:
      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
Locations:
    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
Modems:
    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)

Still not sure what Mac you have, but do you have a multimeter?
You can convert an ATX PSU for use on a G4...
http://atxg4.com/sawtooth.html http://atxg4.com/gige-da.html
http://atxg4.com/quicksilver.html
http://atxg4.com/mdd.html
http://atxg4.com/
Hank, have you tested the MDD PSU?
http://www.jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C 04619.html

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    Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
    3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
    4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
    5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
    6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

  • Why does my Power MAC G4 keep restarting itself after I shut it down?

    Hi,
    Thanks for reading this.
    Why does my Power MAC G4 keep restarting itself after I shut it down?
    This JUST started happening only 4 days ago.
    Most recent installation was Limewire, but I removed it to see if this problem would go away.
    I have 3 internal drives (See drive types below) that all have OS 10 on them in order to be able to boot up from either drive in the event of trouble.
    However...
    No matter WHICH drive I use as the start up drive... the computer STILL restarts itself after it is properly commanded to shut down.
    Prior to the Limewire install... the ADOBE creative suite was installed.
    There is a Lexmark X83 printer hooked to the computer, which, it seems doesn't matter if it is left on or off... the computer still restarts itself.
    Any ideas?
    Thanks!
    PowerMAC G4(2002 Quicksilver)   Mac OS X (10.4.5)   2 Seagate SATA 250GB drives, 80 GB Seagate ATA drive, Digital Performer 4.6
    PowerMAC G4(2002 Quicksilver)   Mac OS X (10.4.5)   2 Seagate SATA 250GB drives, 80 GB Seagate ATA drive, Digital Performer 4.6

    Hi, Tommy!
    If you still have problems, trash the following three preference files, then shut down and do a PMU reset. (PMU reset procedure for the QS is the same as is shown at the link for the Gigabit Ethernet.)
    HD/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
    HD/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
    User/Library/Preferences/com.apple.systemuiserver.plist
    Gary
    1GHz DP G4 Quicksilver 2002, 400MHz B&W rev.2 G3, Mac SE30   Mac OS X (10.4.5)   5G iPod, Epson 2200 & R300 & LW Select 360 Printers, Epson 3200 Scanner

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