Question about Apple iMac 24" Desktop

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Imac24 computer- won't boot up- small clicking sound from dvd when power button is pressed. - found power supply bad- 1 transistor visibly burned up- changed power supply- good to go..

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  • Bill Mar 13, 2009

    Yes the computer started right up & is running with no issues-- as an added test there appears to be voltage display mini leds, (green) on the bottom center of the motherboard. (visible thru the bottom vent screen by the memory chip cover). looks like 3 light up when power is correct, I only had one light before changing the power supply.

  • Bill Mar 15, 2009

    Here's a few suggestions: There appears to be a couple different power supplys in the imac 24's - my suspect model had 2 large aluminum heat sinks on the bottom & sticking out the side. The burned part was visible immidiatly on top of the board (surface mount transistor), examine the power supply components for damage, including any capacitors. A swelled silver top indicates a failed cap from overheat and will need replaced. Likewise I have repaired many motherboards with the swelled capacitor problem. Using a voltmeter, check for presence of +5, +12, +3.3 volts coming out of the power supply to the motherboard and/ or to the hard drive when the computer is turned on. I think there is an addtional +24v to the display.

    http://en.wikipedia.org/wiki/Serial_ATA for power pinouts to the sata drive. Also a bad component may rob power- a non-running fan could be shorted, try unplugging anything that doesn't start--hard drive power- dvd power- fans- or display- (to test without the display listen to see if the hard drive spins up)



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So is it fine now?

Posted on Mar 13, 2009

  • lotfi bouakaz
    lotfi bouakaz Mar 13, 2009

    my problem is I have 3 lights but the top light is off, I cant remember what lights i had before but the last hing i know is that the apple was gone to sleep mode since then it just powers on with fans and nothing else happens, hard disk doesnt spin, no dvd spin

    I am afraid to get a power supply and its same problem. what do you think?


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