9 Replies Latest reply: Feb 2, 2010 12:01 PM by Val_M
Val_M Level 1 Level 1 (0 points)
My computer won't turn on at all! I'm in the process of finding a new battery but I live in a very small town so will have to wait for the mail. However, according to the discussion boards it looked like most people could turn their CPU on when they removed the battery. I can not! So is a new battery going to help me? The computer makes a very faint ding and a brief green flash when I press the power button but that is it.

iMac G3 Graphite DV (Dec 1999).

iMac G3, Mac OS X (10.3.x), slot loading
  • macbig Level 4 Level 4 (1,680 points)
    No, your Mac will not start up without the Pram battery. See this:http://support.apple.com/kb/HT1242
  • spudnuty Level 5 Level 5 (6,120 points)
    Hi Val_M and Welcome to Apple Discussions,
    Well not to contradict macbig but that's kind of a hazy point.
    This is from the service manual for the iMac, iMac DV and SE:
    "Logic Board Battery
    The battery on the logic board controls the stored system settings,
    such as date and time. It is important to note that the battery does
    not affect power at startup. However, if the computer has a “No
    Power” situation, check the battery before replacing modules."
    So the service manual tells you both no it doesn't matter and yes it might so check first.
    It goes on to say:
    "Refer to “Resetting the Logic Board” mentioned earlier in this
    chapter for additional information.
    The battery should be replaced if the system loses date and time
    settings."
    Here's the part about resetting the logic board:
    "Resetting the Logic Board
    Resetting the logic board can resolve many system problems (see
    the Symptom/Cure tables for examples). Whenever you have a
    unit that fails to power up, you should follow this procedure
    before replacing any modules.
    4 Unplug the computer.
    5 Press (reset) the PMU button on the logic board.
    6 Plug the power cord back into the computer and press the
    power on button on the front of the computer. If the computer
    powers on, go on to step 5.
    Note:
    If the computer won’t power up, reset the PMU again,
    this time with the power cable plugged into the computer and
    go on to step 4.
    7 Press the power on button on the front of the computer again.
    If the computer won’t start, go to the next step. If the
    computer does start, you may have a bad battery.
    8 Remove the battery from the logic board. Check that the
    battery is good.
    9 Wait at least 10 minutes before replacing the battery.
    10 Make sure the battery is installed in the correct +/-
    direction.
    11 Power on the computer and test the unit."
    Here's the battery at Radio Shack:
    http://radioshack.lenmar.com/RS/ProductSummary.aspx?Model=LS14250&OEM=Saft%20&ca tID=13
    It's $19.49!
    I buy mine here:
    http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
    Even with $5 shipping it would still be ~ $10.
    The other possibility is that your PAV board is dead. Which is the primary cause of death in these iMac G3s.
    In my experience most of the iMacs I see will turn on w/o the PRAM battery. Try the logic board reset first.
    If I have a relatively fast logic board w/ FireWire and a dead PAV I'll swap that board into a working 350 MHz machine (no FireWire). Email me for instructions if interested. The cheapest I ever bought a 350 for was $20 at the thrift store. Actually people just give them to me. Your info says St Louis.
    Here's a faster one in Westco:
    http://stlouis.craigslist.org/sys/1531319922.html

    Richard

    Message was edited by: spudnuty
  • Val_M Level 1 Level 1 (0 points)
    OK, I tried reseting the PMU with and without the power cord plugged in. Did I need the dead battery in the computer when I did that because I removed it?

    Is the button on the side of the computer the PMU reset button? That's the reset button I used with no luck. I also tried CMD-OPT-P-R with no joy.

    I'm currently on travel with my company so I'm in a small town with access only to a Walmart, Kmart, and a Staples. No radio shack.

    If what I tried above is correct, I'm going to have to wait for a battery in the mail.

    My big issue is that all my pictures are on the hard-drive and my kids just informed me that the computer in STL is belly up too (which is where my pics were backed-up until I burned them to DVD).
  • spudnuty Level 5 Level 5 (6,120 points)
    Hey Val_M,
    Is the button on the side of the computer the PMU reset button?

    Well that one (triangle) is called the reset button. The one with the wavy line is the programmer button.
    The PMU reset button is on the logic board. You open the RAM access door and you can see a button foreword of the RAM sockets on the side of the I/O ports. Push it only once as noted.
    Richard
  • Cyberdog2.0 Level 2 Level 2 (330 points)
    Even if you can't revive the iMac, your pics are still safe and sound on the hard drive. Come back after you try the new PRAM battery if it doesn't work and get help transfering data from the old HD to a new backup.

    There's two kinds of people in the computing world: those who have lost data and those who will. Always backup everything worth keeping.
  • Val_M Level 1 Level 1 (0 points)
    OK, the new PRAM battery finally came in the mail. Unfortunately, the iMac still doesn't power up. So I'm open to how I get access to the harddrive or another method of reviving the computer. Theoretically I have a PC and a Macbook I can use to get access to the iMac. It may take me awhile to try though since the computers aren't all in the same location. Thanks for the help.

    Note: The iMac was my backup to the photos on my PC which I also had backed up to an external harddrive. My iMac and PC both die the same week I hope my external harddrive is still up since it wasn't connected to the PC. I think the PC got a virus. The iMac is just old. So hopefully the only data I'm out is Xmas. I guess when Murphy wants to attack he does.
  • Cyberdog2.0 Level 2 Level 2 (330 points)
    Val_M wrote:
    OK, the new PRAM battery finally came in the mail. Unfortunately, the iMac still doesn't power up.


    Did you install the new battery? Are you sure you put it in the right way?

    So I'm open to how I get access to the harddrive or another method of reviving the computer. Theoretically I have a PC and a Macbook I can use to get access to the iMac. It may take me awhile to try though since the computers aren't all in the same location. Thanks for the help.

    Note: The iMac was my backup to the photos on my PC which I also had backed up to an external harddrive. My iMac and PC both die the same week I hope my external harddrive is still up since it wasn't connected to the PC. I think the PC got a virus. The iMac is just old. So hopefully the only data I'm out is Xmas. I guess when Murphy wants to attack he does.
  • spudnuty Level 5 Level 5 (6,120 points)
    Hey Val,
    The iMac was my backup to the photos on my PC which I also had backed up to an external harddrive. My iMac and PC both die the same week

    OK so even tho' both those computers died the files should still be on the hard drives of both. Especially in the case of the iMac since it probably had it's PAV die. Can't speak to the PC since I don't know how it died.
    an external harddrive.

    So if that hard drive takes a ATA/IDE drive you could pull the drives and put them into the external and read them via you MacBook.
    Take apart for the iMac is here:
    http://www.baconeggs.co.uk/manuals/index.htm
    Good luck.
    Richard
  • Val_M Level 1 Level 1 (0 points)
    Thanks for the link. Hopefully this will work! Unfortunately, I have to go on travel for a month sothis will have to wait until I get back. Thanks for the help.