I made a big mistake!!!

Discussion in 'Mac Basics and Help' started by Sea Side, Sep 14, 2005.

  1. Sea Side macrumors newbie

    Sep 3, 2005
    Oh boy, I think I just killed my iMac while upgrading my internal HD to 160 GB and super drive to a dual layer burner for my iMac G4 800 mhz.

    Initially everything was going well. First I used carbon copy to back up my original HD to an external HD, then took apart my iMac and placed the external as my internal. Put everything back together and pressed the power button, everything booted up fine.

    OK, now for my dual layer dvd burner. Disassembled my iMac as I did before and took out the existing Pioneer burner and replaced it with a NEC dual layer burner. Put everything back, turned on the computer downloaded and installed patchburn so that my new optical drive would be recognized. So far so good, everything is working just fine but then noticed that I missed a few screws. Damn, tore it apart again, looked around and found a home for each missing screw. Bandaged it up again and when I press the power button nothing happens. OH CRAP! :mad:

    Ripped it apart once again, made sure all connectors are tightly secured, all screws in place, and made sure there were no damages to wires. Nothing wrong that I could see, put it back together, pressed the power button and still nothing!!! Not even a screen blip, no BONGGG, can't hear the HD, just plain silence.

    What went wrong?? I spent about two hours trying to trouble shoot and right about now I'm at a loss. HELP!!!
  2. rugonnaeatthat macrumors regular

    Mar 2, 2004
    Adelaide, Australia
    I can't help... but I can offer my condolences. I upgraded my emac a while back and everything worked out - so its not as if Macs cannot be upgraded.

    Firstly - I'd check it's plugged in... (don't hate me for saying this as sometimes in a panic we all forget the basics.)

    Second - think about how the machine works. If nothing happens when the power is switched on then hopefully it is something simple to do with the power button... nothing is indicating it is going further than that - so your mac may not yet be a ride off.

    Of course I don't really know anything... just thought someone should reply in your hour of need :)
  3. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    Hopefully you stopped at Radio Shack and got a 99 cent tube of themal paste, so you don't risk burning up the CPU.
  4. Cloudgazer macrumors 6502


    Apr 22, 2005
    I think you should take out the extra screws!

    A similar thing happened to me a few times when replacing things in my PC.
    I would open the case, replace parts, add RAM, etc, but I always power the PC up before putting the cover back on.
    It would power up perfectly.
    i'd then replace the cover o nthe box, and try power up again.
    nix, nada, nothing.

    Take off the cover - works like a charm.
    Happened a couple of times actually.

    I would be way too scared to open my imac and replace anything
  5. macOSX-tastic macrumors 6502a


    Jan 9, 2005
    At the Airport. UK
    in your hastiness of taking the imac apart, did you remember to touch a metal part of the case? this dissipates any potentially damaging static.


    i thought you might have overlooked this since you were taking it apart and putting it back together quite a few times. but im not 100% on this, so try other things too!

    does your warranty void when you take bits out/put things in?

    i dont know much, but i can lift heavy weights:D

  6. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    If a PMU reset doesn't work, don't know what to tell you.
  7. belvdr macrumors 603

    Aug 15, 2005
    No longer logging into MR
    The big thing to note about the iMac G4 is that the connectors on the base align and seat well with the appropriate connectors in the dome.

    Make absolutely sure they are all connected. The LCD connector, for one, is very delicate.

    EDIT: Also, if you put a long screw in a hole where a short one may have been, you may have driven the screw through something.
  8. Sea Side thread starter macrumors newbie

    Sep 3, 2005
    Just woke up, taking a day off work to fix my iMac.

    I'm hoping I didn't fry my computer, will recheck the connectors, wires, etc. you know the basic things, maybe I might have missed something due to utter fustration.

    If, just if I did fry it what would my options be? Is it over for my iMac? or can it be salvagable??
  9. Sea Side thread starter macrumors newbie

    Sep 3, 2005
    what would be the best way to determine is it's my logic board or power supply that's bad?
  10. Sea Side thread starter macrumors newbie

    Sep 3, 2005
    need some input please.

    i get no power at all, no fan noise, no noise from HD, absolutely no juice running into the system when i press the power button. sounds like a power supply/cord issue don't you think?

    if i had a logic board problem shouldn't i get some indication that at least the computer is trying to power up when i press the power button, but not actually boot up because it's fried???

    any input or suggestions?? Please!
  11. tech4all macrumors 68040


    Jun 13, 2004
    Had similar symptoms with our PC a while back. I would press the power button but the computer would not respond at all. Turned out to be a blown power supply. Put in a new one (with more watts) and it booted right up.

    Not sure if it could be the power supply on the iMac that got blown, but just thought I mention it.

    Hope you get the problem fixed ASAP :)
  12. Sea Side thread starter macrumors newbie

    Sep 3, 2005

    thank's for the reply, that's what i'm hoping for a blown power supply rather than a fried logic board, easier fix.

    but i'm still curious if i had fried my logic board wouldn't i get some response when i power up???
  13. madmax_2069 macrumors 6502a


    Aug 17, 2005
    Springfield Ohio
    have you tryed to take every thing back apart and clean the power connectors ane every connection in the mac take out all the screws and look to see if any are to long and look to see if any are to loose and make shure every thing is seated back properly make shure the power button is clean
  14. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    Do you have a voltage meter, there are some test pads on the machine to see if the power supply is working or you have a dead battery.

    Dowload the Service Manual for your specific machine, you'll find something like this. Your machine may vary in pad number or wire color.
  15. Sea Side thread starter macrumors newbie

    Sep 3, 2005
    Sun Baked,

    Yeah baby, that's what i'm looking for :D

    where can i find that link?

    Thanks soooo much!!!!
  16. bokdol macrumors 6502a


    Jul 23, 2002
    also check the ram slots... there are 2.. one internal and one upgrade slot. if the ram is not seated properly you computer wont start correctly.
  17. Sea Side thread starter macrumors newbie

    Sep 3, 2005
    You guys are GREAT.

    Solution to my problem: Had to reset the PMU on the Logic Board

    Here's how:

    Resetting the PMU on the Logic Board
    Resetting the PMU (Power Management Unit) on the logic board can resolve many system
    problems. Whenever you have a unit that fails to power up, you should follow this procedure
    before replacing any modules.
    1. Disconnect the power cord.
    2 Remove the user access panel from the bottom of the computer.
    3 Press the PMU reset switch (shown below) once on the bottom side of the logic board and then
    proceed to step 3. Do NOT press the PMU reset switch a second time because it could crash the
    PMU chip.
    4 WAIT ten seconds before connecting the power cord and powering the computer on. If the
    computer powers on, go to the next step. If the computer does not power on, there is
    something else wrong with the computer, refer to the symptom/cure, “No Power” in this

    Once again thanks a million, saved me from ditching my iMac!!
  18. tech4all macrumors 68040


    Jun 13, 2004

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