PMU Reset

Discussion in 'PowerPC Macs' started by sree04silverdr, Aug 7, 2013.

  1. sree04silverdr macrumors newbie

    Joined:
    Aug 6, 2013
    #1
    so last night I opened up my mac and reset the PMU, I held the button and released it right away (am I supposed to hold it down longer?) Anyway, I plugged everything back in and it still wouldn't turn on. Quick question, by replacing the battery will it necessarily get the computer to turn on or am I looking at a failed PSU?

    p.s. i originally posted this on my older thread, i figure i should start a new one with this, thanks!
     
  2. Swampus macrumors 6502

    Swampus

    Joined:
    Jun 20, 2013
    Location:
    Winterfell
    #2
    Do you have a multi-meter to test your PSU?

    Pinout:

    [​IMG]
     
  3. cocacolakid, Aug 7, 2013
    Last edited: Aug 7, 2013

    cocacolakid macrumors 65816

    cocacolakid

    Joined:
    Dec 18, 2010
    Location:
    Chicago
    #3
    Didn't you also say it wasn't keeping time/date? That means the battery is dead. So if we know the battery is dead because it won't keep time/date while off, and it started acting erratically just before it stopped booting, those are symptoms of a dead PRAM battery (and some symptoms of a dead PSU but even if you replace the PSU you still need to replace the PRAM battery).

    An old CoM guide on troubleshooting Macs mentions dead PRAM batteries...

    http://www.cultofmac.com/50685/how-to-fix-common-mac-startup-problems-macrx/

    As others said in the other thread, a dead or dying/low voltage battery will wreck havoc with a Mac.

    Are you in the U.S.?

    Here's one for under $5 shipped at Amazon, eBay prices are about the same, cheaper than the last time i had to replace on a few years ago.

    http://www.amazon.com/Saft-LS-14250-Lithium-computers-Rechargeable/dp/B002GJSQPO
     
  4. sree04silverdr thread starter macrumors newbie

    Joined:
    Aug 6, 2013
    #4
    PMU Reset

    Thanks for the link cocacolakid, I will order it today and write back once I receive it and install it. Hopefully that will do the trick!
     
  5. sree04silverdr thread starter macrumors newbie

    Joined:
    Aug 6, 2013
    #5
    PMU Reset

    I just got the battery in last night and was able to replace it. I reset my PMU and started up the computer without any problems! Thanks to everyone who contributed to the solution!!!!!!:cool:
     
  6. cocacolakid macrumors 65816

    cocacolakid

    Joined:
    Dec 18, 2010
    Location:
    Chicago
    #6
    That's great! Good news!
     

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