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

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My iMac cannot turn on, how to repair by myself?

My imac 21.5 inch cannot turn on..nothing happen when I press the button on..I already check the electrity and fuse..what else I can do? How to repair by my self?

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haz17, what are the last three digits of your computers serial number? that will help us to properly identify your computer. Did anything happen to it or did it just stop working? Any history you can give us will be helpful.

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Serial no w8026qgddas...my imac had no problems before this, just a month before I find it hard to press the power on. Press power on many times and for 5-10 second only it worked until yesterday no responsed at all!

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I've just open the power supply..my imac power supply ok with electricity flowing... so now what next 1 must check??

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Use almost any of the guides to get the frame off, this one will do: iMac Intel 21.5" EMC 2428 Power Supply Replacement

Open it up and observe the LED diagnostic lights to the right of the RAM slots and tell us what you find.

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Ok will do..have to buy suction cup

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I've just open the power supply..my imac power supply ok with electricity flowing... so now what next 1 must check??

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Have you tried resetting the SMC? See http://support.apple.com/kb/ht3964

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haz17 will be eternally grateful.
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