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I have an early 2008 iMac, 3.06 GHz Core 2 Duo (E8435), model A1225 (EMC 2211). It has 6Gb of ram and a 2TB Western Digital Black hd, along with the Nvidia Geforce 8800GS video card. It has been a great computer. Over the past 5 years of owning it, the LCD went defective twice, as did the video card, and they were replaced under warranty. But yesterday, the computer made a lovely (and loud) POP like a firecracker went off in the system, then died, leaving behind the faint smell of sulfur in the air. I did my research, popped it open and checked the diagnostic led’s, and they were all off, possibly indicating that my 661-4665 PSU was dead. In trying to find a replacement PSU, I discovered that Apple discontinued the 661-4665 unit (that has 3 heat sinks on it) and replaced it on the next 3.06Ghz iMac with a 661-4995 psu that does not have heat sinks, and is built by Delta instead of the previous LiteOn. The new 661-4995 unit appears to be a little more solidly built, and I was wondering if the 661-4995 will work properly in my system, or should I simply replace it with another 661-4665? All the connections on them are the same, and the mounting points are identical as near as I can tell. Just need to know which direction to go! Thanks very much! Stephen
Stephen - Sorry you’re having a bad case of luck here. Have you tried leaving the display & HD unplugged as well as pull the memory to see what the diag LED’s do? If you get some sign of life you should be able to slowly add things back in to figure out what is shorted out causing the power supply not to power things. A few questions here: Did you have your computer plugged into a surge protector or UPS?Are you using a cheater plug so you can plug into a two pronged outlet?Have you had an electrician or your self check the ground service of your house and the outlet you are using?Have you had any storms in the area where lighting might have hit near you? Also, when you take your system apart again make a good visual inspection of the logic board (both sides) Its’ possible a capacitor or other component went on you.
My source (welovemacs.com) does not list these as interchangeable. http://www.welovemacs.com/6614665.html However powerbookmedic.com lists these part numbers as compatible: 661-4183, 661-4422, 661-4478, 661-4665, 661-4995 http://www.powerbookmedic.com/Intel-iMac… I’d go with the best price ;-) Thanks for the email. Glad to try to help!
FYI… I recently replaced a dead power supply, 661-4665, in Early 2008 iMac 27" with the newer 661-4995 model. Same specs, same shape, same size, etc. Fits perfectly and works perfectly. In service for two months with no issues.
