Why isn't my iMac A1311 not booting when the glass panel is installed?

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iMac Intel 21.5" EMC 2428

Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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FITCom @fitcom

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Posted: Jul 9, 2018

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Why isn't my iMac A1311 not booting when the glass panel is installed?

My iMac A1311 / EMC2428 was powering on intermittently and stopped working completely. Tests showed that the power switch was faulty.

Before, I found that the unit case, especially near the PSU was getting pretty hot so initially I thought the PSU was bad.

As I couldn't get an OEM replacement switch I installed a 'normally open' switch. This switch worked perfectly, but notice that when I install the glass panel the unit will not boot. Only when the panel is off it will boot successfully.

Any suggestions on the possible cause / fix will be greatly appreciated.

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4 Comments:

Where did you route this new switch?

Often I manage to get the switch to work again by just doing a good job cleaning it and sometimes needing to rebuild it a bit.

Jul 9, 2018 by Dan

Thanks Dan.

I installed the new switch on the bottom of the outer case, next to the RAM compartment.

I considered cleaning the original switch but getting to it would have been quite a task, plus, I wasn't sure if that would have resolved the switch issue.

Jul 9, 2018 by FITCom

Sounds like it’s shorting out when you’ve put the panel on

Jul 9, 2018 by Ben

I agree with Ben here sounds like the mounting location is a bit to close to the display assembly.

Jul 9, 2018 by Dan

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1 Answer

Where did you route this new switch?

Often I manage to get the switch to work again by just doing a good job cleaning it and sometimes needing to rebuild it a bit. — Dan
Thanks Dan.

I installed the new switch on the bottom of the outer case, next to the RAM compartment.

I considered cleaning the original switch but getting to it would have been quite a task, plus, I wasn't sure if that would have resolved the switch issue. — FITCom
Sounds like it’s shorting out when you’ve put the panel on — Ben
I agree with Ben here sounds like the mounting location is a bit to close to the display assembly. — Dan