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

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iMac 7,1 doesn´t boot when is cold?, any clues about what it can be?

Hi there!!, my best wishes for a wonderful day to all of you reading me :) , I was just wondering if there´s someone that have experienced before the same situation:

My iMac 7,1 doesn´t run if is cold ( for example circa 16ºC), sometimes I have to try several times, normally I just put it out in the sun for awhile, or just use an electric heater if is winter time..., then it runs, ( sometimes several times trying needed, plugin and unplugin the power cord ..., with the heater directed to it..until it finally runs), after to have been working on it for awhile, if I leave it on "stand by" (sleep mode) during the whole night (but need to be exclusively running a program, for example: I play a video file on VLC , pause it, and leave it that way until the screen is off and that`s it, so next day no need to switch it on and it works, but if not on that "state", then it will just turn off when I try to "awake" him, so next step is the one we already know, sun or electric heater....etc. etc.

Apart from this I have been also facing few difficulties with other issues which I will post in another questions, cause maybe is the proper way to do it, but I think that maybe it helps also to know about the fact that the original 3.5" hard disk (with temperature sensor...), got broken, so I replaced initially with a Seagate Barracuda 1TB, it worked, but then I started to have this problem I am exposing on this thread (to be honest not sure if from the day I replaced or later), then I got exhausted, so I decided to try an SSD and suddenly changed my mind to a Firecuda Hybrid HD 1TB (ssd and hard disk also) in order to see if it could solve the booting problem and it didn´t, I also realised that the optical drive (with temperature sensor...) wasn´t working, so I just removed it (actually is one of the issues I mentioned before, which is about to install windows onto El Capitan and seems like no way without optical drive...), now the last try was a full SSD 256GB , and it did not solve the problem either, still having the same problem, need to be heated.

Finally I will only add that I did the diagnostic test leds , and when it fails to boot, led #1 is on leds #2 and #3 blink, fan starts, but then all switch off and need to unplug the cable and plug it again, led #1 on again...., sometimes you cannot even hear the typical starting sound when it tries to run, actually when you heating it it slowly last a little bit longer gradually (assuming that is the temperature, no idea exactly where or whats the part that really need to be warm in order to make it possible to run) , until finally it "gets it".

Not having to much more to say from now, I would be more than glad to say thanks for the great job you all do here guys sharing all your knowledge, is definitely a good way to provide for humanity fighting ignorance. Thank you very much in advance for your help and the time dedicated to analyze my case.

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The age of your system tells me you likely have bad electrolytic capacitors! Capacitor Plague within the power supply iMac Intel 24" EMC 2267 2.66, 2.93 & 3.06 GHz Power Supply

iMac Intel 24" EMC 2267 2.66, 2.93 & 3.06 GHz Power Supply Görseli

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iMac Intel 24" EMC 2267 2.66, 2.93 & 3.06 GHz Power Supply

$139.99

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Hi Dan, thanks a lot for your reply, I will appreciate it a lot if you could be little bit more specific in regard to the way I should fix it,

I mean, is there any possibility just to replace the capacitors, or need a full power supply straight away? Also it would help a lot to know which other options are possible, such as: can the PS be replaced by a PS from an iMac 20" 2008?

I was already looking for some other options and I can see the ps from this 20" is only 180w and the one I have is 250w, so I understand that probably it is not the right option, but I'm not a PRO on this so I'm just asking in order to find the best way to solve it, the link you sent me for example is for 2.66 until 3.06 GHz (mine is 2.4GHz) and the price of a PS is almost the price of my iMac if I want to sell it 2nd hand.. :), so maybe just better to get a very cheap iMac that I can use for spare and repair?

in this case, there´s any other iMac model that can provide me a PS and maybe also an optical drive which can fit on mine?

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@ssaltarin - Sure if you're game replacing the caps is something you can do. It's a fair amount of work! Between finding the correct caps and then getting the old ones out. Its about 15 you need to replace (all) or just attack the visibly bad units and hope for the best.

At one point a few folks had created cap kits! Packaging up for these PS's, that was years ago. Sorry time is your enemy here ;-{

As far as the wattage... let's think it like a car engine, would you put a little VW Beetle engine into a big Mack dump truck? Carrying 10 tons of earth up a hill just won't get there ;-} So to be clear you need the correct wattage for the system 250w is what you need.

I don't set the price and availability is also a factor. I'm sure you can find a used 661-4995 power supply and you do need to stick with the correct one as Apple contracted the PS construction from the PS makers and the connections are unique to them.

As far as the optical drive this series uses a PATA interface 8X PATA Super Drive, Apple P/N 661-4385

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