Strange behaviour from a Macbook Pro

Discussion in 'MacBook Pro' started by 00hkelly, Jan 23, 2008.

  1. 00hkelly macrumors 6502

    Nov 15, 2006
    Hi, until this morning my macbook pro was fine, nothing strange.

    however now, it is as though no charge can get from the battery to the computer. The battery charges fine and the computer works on power. However even with the battery full, if I unplug the computer from the power, after about 10 seconds the computer suffers a power failure (as if you are using it with no battery in and the power is pulled out), sounds exactly like a hard reset you hear the hd head clunk and the pishwt noise(cant believe i just wrote 'pishwt' ). also the macbook will sleep fine and stay sleeping on battery power, but when you wake it from sleep it begins the process (hear the superdrive whirr (no dodgy phonetics this time) and then the power failure again. The same thing happens from a cold start , once got half a second of the chime and all went dead.

    anyway this seems very strange behaviour, i have run disk checks and verification, there is nothing in the logs to my knowledge that indicates this. I dont believe this could be a software thing due to the nature of it.
    I was using it as normal last night, put it to sleep on the power, woke it up this morning off the power and worked fine. put it to sleep took it to college, opened it up and problem city.

    sorry to ramble, but I would appreciate any help anyone could offer.

    many thanks,
  2. iCeFuSiOn macrumors 6502a

    Jul 18, 2007
    I'd run the Apple Hardware Diagnostics on it. Also, have you checked the battery meter on the bottom of the notebook? This meter will show any charge that's on the battery.

    How old is your MacBook Pro? You may also want to look at the following link, which assists you in resetting your MacBook Pro's PMU (Power Management Unit).
  3. grooveattack macrumors 6502a

    Jan 9, 2008
    hey. i had the exact same problem with my macbook a few weeks ago. pulled the plug then after a while it kinda goes into a coma and only wakes when you re-plug. just took mine into apple shop and they changed my battery and it works fine now.
  4. 00hkelly thread starter macrumors 6502

    Nov 15, 2006
    thanks for your replies,

    do you have a location of the diagnostics that i could download (a friend had the disk after the genius bar left it in but he is some distance from me at the moment).

    resetting the PMU was one of the first things I did after all the usual trouble shooting, then searching on google/forums, then eventually posting here.

    it doesnt go into a coma, it is a complete loss of power, if i want to start the computer up again I have to plug the computer into the power and it will boot from cold, even if i had been doing work or comp had been sleeping.

    I have had this macbook pro just over a year (just out of warranty, typical) but i have insurance so cost isnt a big issue.
  5. Jiddick ExRex macrumors 65816

    Jiddick ExRex

    May 14, 2006
    Roskilde, DK
  6. 00hkelly thread starter macrumors 6502

    Nov 15, 2006
    I am reluctant to believe that is is just a bayyery issue i use myblaptop on a daily basis on and off the power and frequently fully charge/discharge the battery it currently has done 315 cycles and is at 75% health. The battery holds its charge fine, the lights on the battery correspond with what os x indicates and apart from the obvious problem there are no hardware or software indications that anything is wrong.
  7. r88my macrumors regular

    Oct 28, 2007
    Manchester UK
    There was a big battery issue with the macbook pro. I had mine replaced after experiencing symptoms that you describe (so did alot of others on various threads on these forums). Best bet is to call apple.

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