Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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iMac won't turn on

Hello,

I have a imac mid 2010 and it won't turn on at all no fans no nothing. I took it to a repair shop they replaced the power supply board and still nothing. They wanted to replace the logic board next but I pulled my imac because they gave me a crazy expensive estimate and I'm sure I can do it myself.what do you think it could be. I checked the power chord and it's getting power so I have no idea what I should do next. Please help!

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@greezy91 exactly which iMac is it?

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@oldturkey03 its EMC:2390

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@greezy91 good so the answer is the same:-)

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2 Answers

Chosen Solution

@greezy91 start off by checking what Apple suggest:

No Power, Dead Unit

Symptoms Quick Check

No Power, Dead Unit

• No power

• No fan spin

• No startup chime

• No image on external display

• No hard drive or optical drive activity

• Caps Lock LED on wired keyboard doesn’t light when pressed.

1. Verify power source.

2. Verify power cable.

3. Listen closely for signs of activity from system including: rotating fans, hard drive or optical drive

activity, startup chime, etc.

Deep Dive

1. Power ON system. Verify if there is any indication that the system has powered up (fan rotation, hard drive or optical drive noise, backlight turns on).

Yes The symptom is powering up.

Go to Won’t Start Up.

No Go to step 2.

2. Disconnect AC cable Remove glass and LCD panel and locate the diagnostic LEDs in the middle of logic board. Reconnect AC cable to system. Verify if diagnostic LED #1 turns ON. You may alternately check for presence of a 12V DC signal between pin 4 and pin 1 of the logic board.

Yes Standby power voltage being supplied by power supply.

Go to step 3.

No Go to step 4.

3. Press power button while monitoring diagnostic LEDs. Verify if LED #2 turns ON and remains ON after releasing the power button. You may alternately check for a power request signal between pin 12 and pin 1 of logic board.

Yes Power supply functioning and logic board detects supply voltages and is powered on.

Go to Won’t Start Up.

No Go to step 5.

4. Disconnect AC cable. Carefully inspect the connectors between AC inlet and power supply, then DC

connectors and cables between power supply and logic board, for damage or poor connections.

Yes Reseat misconnected cable(s), or replace damaged one(s).

No Replace DC power cable harness. Go to step 8.

5. Inspect power button and verify if it is properly connected to the logic board.

Yes Go to step 6.

No Reconnect power button.

6. Disconnect power button from logic board. Inspect cable and connector for damage. Using a multimeter (set as ohmmeter), verify continuity between the two pins of the power button when it is pressed.

Yes Power button is functioning correctly. Reconnect power button to logic board and go to step 7.

No Power button faulty. Replace rear housing (which includes power button).

7. Reconnect AC cable Press power button and Verify if system turns ON. You may alternately check for presence of a 12V DC signal between pin 11 and pin 1 of logic board when power button is pressed.

Yes Power supply functioning. If system still won’t boot, go to Won’t Start Up.

No Replace DC power cable harness. Go to step 8.

8. Press power button and verify if system turns ON.

Yes Issue solved with replaced DC power cable harness.

No Replace power supply.

Go to step 9.

9. Press power button and verify if system turns ON.

Yes Issue solved with replaced power supply.

No Reinstall power supply and replace logic board.

If No Power symptom persists after all steps have been followed use minimum configuration troubleshooting to proceed. Try disconnecting hard drive(s), optical drive, AirPort, , SD card modules and Bluetooth/Camera cable to determine if one of them is preventing the power supply from functioning.

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1. Overheating: This is probably the most common problem. First, look at the area around your computer. If you have a laptop, there are air vents around the sides and on the bottom. If it is a desktop, ensure the fans are unobstructed.

2. If it still reboots, it may be your RAM, and in some rare cases, your processor. These are hard to determine unless you replace them. Not necessarily expensive (compared to a new computer), but you are buying stuff to check it out without knowing whether it will work. If you do buy some RAM, you may want to increase to 4 GB, or more if you computer can accommodate it.

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Kyle Greer will be eternally grateful.
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