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Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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Change power switch button? How?

Hello. How can I change the power switch button and where can I buy a new one?

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Can you explain why you need to replace the button. Are you having problems turning the system on or is the system not powering up?


Yes there is a problem to turn on the system. Have a special way to push the button. If I miss it than it is very difficult to turn on again. Have to push about 20 times then the Mac turning on with full rpm fan. After that I have to shut down pull out from the electric wait about 15sec put in to the electric and do that tricky push to start normally again.


I had the same problem with my iMac 2009 27 inch...The power button needs to be pressed multiple times 10-20 times to get it started. Or sometimes it won't start...


Please help me out


I broke the cable connector leading to the power supply. So i need to get the power button out and re-solder the broken wire. How do I remove the power button assembly ???


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From your symptoms I suspect your PSU is going. All of Apple's systems use a soft power switch. Basically a low voltage momentary button switch which via some logic switches on the AC line.

I don't think the mechanical switch it's self is defective here but the switching logic on the PSU. Follow this IFIXIT guide iMac Intel 21.5" EMC 2389 Power Supply Replacement.

I would also double check your AC power service. Get a outlet tester to check ground and polarity.

Do you have a surge suppressor or UPS? If not I do recommend using them. All my personal systems are on UPS's and most of our systems at work are as well. UPS's offer the best protection and allow you to continue working when the power goes out allowing you to shutdown the system cleanly.

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If you really want to be sure what is the problem....

You'll need help to do this... Open you iMac and just lean the lcd to be able to blow the power supply section with your hair dryer and eat ONLY the power supply section .... ( Ask some one to keep the LCD in place...) When heating press the power button some time and when the power supply will get enough heat it should start... It is able to get a lot of heat but don't melt anything too...

This is a temporrary fix to determine and isolate the problem. Once you are sure that is the power supply.. Replace it!


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