Power Mac won't turn on

I have a Power Mac  G4 that will not start.  The power button lights then goes out after a second.  Checked lithium  battery voltage, it was fine.  Reset PMU on motherboard as well.  Any ideas?

Make sure you disconnect all peripherals, even the keyboard and mouse (but leave the display connected), when you press the power button.  I've had a faulty USB device that interfered with startup before.
If the power cord is connected to a power strip (surge suppressor) of some type, try it connected directly to a wall outlet, by itself.
It could be a faulty power supply.  Is the behavior any different, if you disconnect the Mac from power for about 15 minutes, then try again?

Similar Messages

  • My mac won't turn on

    My mac won't turn on and I want to try and back up my files in case it needs to be reformatted. Is this possible if it won't turn on?

    See this Apple note on systems that won't power up. If the system won't power on, the only way to backup your files is to remove the hard drive from the system, and either put it into a case or attach a cable so another system can read it.

  • Installed Yosemite...Mac won't turn off.

    Installed yosemite, now my mac won’t turn off completely. All apps are off.  After choosing shut down, It doesn’t shut the white light. It looks like it’s in power down mode. But nothing will turn it back on except having to hold down the power button to completely turn it off in Yosemite. then pressing it again to turn it back on. Help!!!!

    LRD777 wrote:
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  • Today my mac won't turn on at all...the light at the front is remaining on and at a constant brightness however the screen is still black! I'm not sure what to do next?

    today my mac won't turn on at all...the light at the front is remaining on and at a constant brightness however the screen is still black! I'm not sure what to do next?

    If you can log in blindly or using the flashlight method, it is possible your screen brightness somehow got set all the way to nothing.  I don't have my Macbook with me right now to test it out but I believe it may not be possible to adjust the brightness at the log-in screen so you have to be able to log in first (though I could be wrong on that).

  • TS1713 Mac won't turn on.

    Mac won't turn on, it's plugged in

    Look at the steps in this Apple support article:
    http://support.apple.com/kb/TS1367?viewlocale=en_US
    Ciao.

  • My mac won't turn on. It has the apple sign but a little loading sign under it, for about an hour

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    Will it boot up in safe mode?
    http://support.apple.com/kb/ph11212
    or can you enter single-user mode?
    https://support.apple.com/kb/ht1492
    What version of OSX are you running?

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    Pull your hard drives.
    Put in your OEM DVD
    Hold down the letter d on startup and run Apple Hardware Test
    Put in your latest OS X DVD and hold c
    Does it do both.
    Oh, and Reset SMC.
    http://www.apple.com/support/macpro
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    Message was edited by: Brian Hoisington

    Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
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    There is a rather gloomy symptom chart (at page 104 in Preview) here - and also instructions.
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    http://www.dvwarehouse.com/G5-Power-Supply-c-253247541.html&pltid=723fda346ab59730cfb5d40ab2fecc68
    http://www.mac-pro.com/Mac-Pro-Online-Store/PowerMacs-Intel-MacPro-Towers
    http://www.welovemacs.com/g5serviceparts.html
    and elsewhere.
    Please post again if you have any questions. Good Luck.

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    Intel-based iMac: What to do if your computer won't turn on

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    One of the dimm modules may be your problem. Turn your power off and eject two of the dimms and leave one seated. You don't have to take the two that are ejected out of the ejector tabs, just make sure they are not seated in the socket in the locked postition. Power up and listen for startup chime. If you get a chime, power down. Push down one of the ejected dimms and make sure it's seated.You'll now have two dimm's engaged. Power up and listen for chime. If you get one, go through the routine again powering down and trying it out with all dimms seated. Depending on which dimm is bad,you'll get no chime if it is seated. If you get no chime when any dimm seated, then you have something seriously wrong with your motherboard or you have something hanging out of the buss when it should be in (for example, an AGP card loose in its socket).

  • TS1367 Mac won't turn on

    help, mac air won't turn on. No light. No nothing. Checked different power points but still no sign of life. Can anyone give me an idea of what is wrong?

    Try replacing the battery. If you can't replace the battery take it to your nearest Apple Genius Bar or Apple Repair Centre.

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  • HELP, My MAC won't turn ON

    My computer won't turn on. When you hit the power button you can hear the fans turn on but thats about it. This has happened in the past, it's not turned on for about 3 days but then all of sudden it starts working again. Its been about 5 days now and I'm starting to get worried. I hear the fans running but thats it, I can't eject the CD tray and I can't see any video. What should I do??
    iMac g4   Mac OS X (10.4.5)  

    CDiddyHustle, 
    Welcome to Apple Discussions, Sorry about the circumstances!
    To help identify what's at fault could you please post back with the following details:
    Do you get the Start-Up chime?
    Does the Optical Mouse light up/Caps Lock light come on or off?
    If you shine a torch at the display and look closely can you see any images?
    If you have a VGA display adaptor - can you see any display if you plug it in to your TV or similar.
    If you reset the PRAM - hold down the <apple>
    <r><alt>keys in during start-up until you hear the computer appear to restart.
    If you hold down the mouse button during start-up does the CD tray open?
    Was the computer showing any other symptoms recently - dimming display, Kernel panics, poor USB connections, grinding noises in the hard disk?
    Do you have a clean electrical supply in your part of the world?
    mrtotes

  • Turn on! My mac won't turn on after sleeping!

    Ever had a problem where your computer won't turn on after sleeping for a few minutes? (I've discovered that too many downloads cause this) Anyway... have you ever tried pushing the power button for one second? Try it! It's been working for me! Hope this helped!
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    Try resetting the SMC and PRAM
    Intel-based Macs: Resetting the System Management Controller (SMC)
      About NVRAM and PRAM

  • 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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