Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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iMac "Core 2 Duo" 2.4 24-Inch (Al) completely dead. Help!

Dear All,

i had a bad luck to buy second-hand iMac from Yahoo Auctions Japan. It was (as I saw after all) indirectly described (in japanese) that mac stop starting. So, at home when I got my lively mac, opened box, got comp, plugged, pressed Power button, and saw nothing at all: no picture, no sound, no any movement, complete black silent. :(

Is any fuse inside I can replace, or power supply, or how to find a wrong unit??? (it's not a cable issue - 100%). Sorry, I'm just beginner. Will appreciate any advice.

Answered! View the answer I have this problem too

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did you fix it? my imac have the same problem

== Update ==

JUST FOUND ONE DIODE IN POWER SUPPLY UNIT BURNT OUT...

NOW LOOKING FOR NEW POWER UNIT

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Hi Vitali, I have had luck with previous generation iMacs G5, but no luck with my 24' and 20' intel based iMacs.

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Did you fix your iMac? I'd like to know if it was the power supply or the logic board . . . .

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Did you fix your iMac? I'd like to know if it was the power supply or the logic board . . . .

TommyJames337, 8 hours ago

Yes, I did. Power supply was defective in my case.

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These machines have diagnostic LEDs on the logic board. You'll have to take off the front glass (suction cups required) and front bezel. They are located on the right hand side underneath the screen, you may have to move some cables aside to spot them. The first one should light up when the computer is connected to a power source. the second one should light up when you press the power button Number three and four are video related and show you if the graphic chip is initialized and wether there is connection to the display.

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+ good

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Thanks! I did open, but can't see LEDs in right corner:

http://i786.photobucket.com/albums/yy149...

I up screen a little, but still can not locate them:

http://i786.photobucket.com/albums/yy149...

Maybe this Mac has no LEDs?

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Please tell ms the serial number for the thing. I can't work out that %&$§" model numbers.

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Sorry for confusion. iMac 24"/2.4GHZ/1GB(now 2)/320GB/SD/AM/BT Serial No.: W881208FX89 EMC No.: 2134 Model No.: A1225

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it's not an easy call - i would first try to measure the power supply and i would check the logic board for obvious damages

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+ Get yourself a multimeter and start testing.

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OK. My multimeter is ready. Is any good link about measurement of Power Supply. I didn't see any burning on Logic Board, but that was only first look.

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...and I have prepared the Power Supply. It doesn't look burnt: http://i786.photobucket.com/albums/yy149... I took it out for testing: http://i786.photobucket.com/albums/yy149... still can not see black spots: http://i786.photobucket.com/albums/yy149... The interesting thing - they are talking about fuse: http://i786.photobucket.com/albums/yy149... Could it be as simple as replace small piece? http://i786.photobucket.com/albums/yy149... Maybe not with my luck. Did any geek go in deep? :)

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The 24" white plastic iMac A1200 (EMC2111) has a fuse soldered on the power supply. The fuse is covered in black shrink tubing, and it is located close to the power input (2 wire cable). That fuse blew on my iMAC when the 420V, 250 uF capacitor in the power supply ruptured open.

I soldered in a replacement fuse, and a new capacitor and now my iMAc runs beatiful

Eric

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Hi Eric,

I have the same power supply problem with my A1200. I found two big capacitors, one is 420v 150 mF, another is 420v 82 mF. Did you replace

both ?

Thanks

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Hi Vitali,

Both capacitors are in parallel. I removed both and replaced them with a single 250uF 400V, from an IBM power supply. The actual voltage measured 400V, so I think the voltage rating is sufficient. The new capacitor is physically too large to fit the apple power supply, so I connected it with long wires and taped it inside the housing, beside the power supply.

Eric

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is there any 1 els you know with mac ........

if so you can network it with a wire from 1 of the ports at the back get the other mac to scan it for you

you can use internet software for this

OR just take it to mac shop because they helped me allot (it may need a servicing witch will cost a lil)

hope this helps a lil

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Booting in Target mode with a firewire cable will only work if the computer will boot.

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Thanks! Sounds like science fiction for me. :) One robot cures dead partner. Is Power Book G4 good for this? Any link if you have, please?

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Just back from Apple shop. To check iMac will cost 50$ (in equivalent from yen), to replace of Power Supply - 300$, Logic Board - 750$. Too much for me. :( I better try by myself as much as possible.

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I had same dead mac issue. I replaced the power supply with a new one and it all worked fine... for about 3 hours at which point the imac just turned off again and would not boot. This time however the diagnostic LEDS were active and I had power, logic and video power. The machine then suddenly started after about 30 mins of staring at the diagnostic LEDS but I got the folder with ? mark in it and it would not boot. Very strange indeed. All LEDS are lit up but it just hangs now on the folder with ? in it.

Any advice.

2008, iMac, 24inch, Core Due 3.02GHZ, 500GB HDD, 2 X 1 GIG RAM.

Update

As an update. After leaving it unplugged for 30 mins I tried booting again. It gets about halfway through the apple start-up chime and then reboots only again to get halfway through the start-up chime and then reboot again. IT is stuck in this loop.

Arrrgh!

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Did you check into the Logic board if you had some Capacitors that are bursted? "Top Bombed" normally is flat. Inspect for all capacitors on the logic board (both sides of the logic board).

See the comparaison:

[LEFT] Busted Capacitor;

[RIGHT] New Capacitor.

http://www.instructables.com/files/deriv...

Sometimes, it's not the power supply the issue. When some capacitors in the logic board is broken it gives that king of symptômes.

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Igor will be eternally grateful.
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