Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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I bought Imac 27inch in may 2014 which failed the very first time with internal power supply failure with smoke and bang. Apple replaced me with the new one which also worked for 1 week and broke seemingly with the logic board failure. Subsequently 4 machines have been replaced with the new ones and all failed within 1 month. I was wondering may be it is my power circuit issue. I called an electrician to check my surge protector power board and power supply and confirmed that power supply is fine. All my equipment and my laptop are working fine since last 7 years.

I inferred that apple have placed a logic boards in their computers which will fail at some point in time due to faulty product supplied to them by the third party.

Please be careful when getting Imac computers.

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Your failure rate is unprecedented. I suspect you are getting power spikes, try getting a UPS (uninterrupted power supply) to protect your machine. This problem may only be one one electrical circuit.

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Raj 将永远感激不已
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