Will not power on, hear a slight fan sound but then nothing.

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iMac Intel 21.5" EMC 2389

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

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Ian Hurley @ianhurley51729

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发帖于: 2015年4月28日

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Will not power on, hear a slight fan sound but then nothing.

The machine was running, when I can back to my desk the screen was blank. I tried to power it on but nothing happened. Checked all the cords and removed all external devices. How do I test to see if it's the power supply or something else?

I replaced the power supply as instructed, but the machine still will not start. It sounds a little different when tiring to start, I hear what sounds like the HD spinning. Checked the LED test lights and still only the #1 is lit up.

Thanks

Ian

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OK, I replaced the power supply but no difference. Maybe the hard drive sounds like its running?

由 Ian Hurley 完成的 2015年4月30日

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mayer @mayer

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You need to take a look at the diagnostic LEDs. Take a look at this question for how to interpret them and location: Where are the diagnostic led's on this model's logic board

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Try using this guide but not disconnecting the cables yet. Just lean the display forward and see if you can see the LEDs. iMac 因特尔 21.5" EMC 2389 显示屏更换

由 mayer 完成的 2015年4月28日

Do I remove the display first

由 Ian Hurley 完成的 2015年4月28日

I can not disconnect the LCD thermal sensor cable connector from its socket on the logic board.Does not want to pull off. Am I missing something?

由 Ian Hurley 完成的 2015年4月28日

I got the display cable off. Plugged the computer in. The only LED light that comes on is the #1. It stays on but that's it. Pressing the power button results in what sounds like the hard drive trying to start up. A couple of clicks then nothing.

由 Ian Hurley 完成的 2015年4月28日

Replace the power supply. Here's how: iMac Intel 21.5" EMC 2389 Power Supply Replacement Here's the part: iMac Intel 21.5" (Late 2009-Mid 2011) Power Supply

由 mayer 完成的 2015年4月28日

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OK, I replaced the power supply but no difference. Maybe the hard drive sounds like its running? — Ian Hurley
Try using this guide but not disconnecting the cables yet. Just lean the display forward and see if you can see the LEDs. iMac 因特尔 21.5" EMC 2389 显示屏更换 — mayer
I can not disconnect the LCD thermal sensor cable connector from its socket on the logic board.Does not want to pull off. Am I missing something? — Ian Hurley
I got the display cable off. Plugged the computer in. The only LED light that comes on is the #1. It stays on but that's it. Pressing the power button results in what sounds like the hard drive trying to start up. A couple of clicks then nothing. — Ian Hurley
Replace the power supply. Here's how: iMac Intel 21.5" EMC 2389 Power Supply Replacement Here's the part: iMac Intel 21.5" (Late 2009-Mid 2011) Power Supply — mayer

iMac Intel 21.5" EMC 2389

Will not power on, hear a slight fan sound but then nothing.

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