1.83 GHz Core Duo or 1.83, 2, or 2.16 GHz Core 2 Duo A1208 (EMC 2104/2110/2114/2124)

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My iMac will not turn on

hello people my intel iMac (white) will not boot when i press the power button the led says on and the fans run at maximum until i force the iMac to turn off i have tried resetting the sac pram nvram etc... can anybody help? also i have changed ram and still no luck thanks.

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Probably dead mate, how old is it ?

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@note7grenade around here there is no "dead". That is the reason for existence for this website. We try to keep things alive for as long as possible. So, age is no exclusion.

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@oldturkey03 instead of lecturing me could you help the person ?

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thanks guys for the comments i suspect its the graphics chip but im not sure

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@jacobpem identify your iMac by using your serial number on here http://www.everymac.com/ultimate-mac-loo... then let us know which model it is.

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This answer is basically for the G5 machine. Will do better when we know your exact machine.

Pop the back off. Note the two CUDA buttons the logic board. On is a reset and one a power on.

Hit both with the machine plugged in. Observe the diagnostic lights in the center of the board and tell us what you see. Also examine the 24 "cans" capacitors for swelling, and/or leakage.

UPDATE for intel model

There are possibly diagnostic LEDs to the right of the RAM slots (sometimes they can covered by a small piece of black tape that may need to be removed). Please tell us if your have them and what they are showing.

LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.

LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.

LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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this machine is a intel september 2006 model

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There were five 2006 intel 17" machines. The serial number from the bottom of the stand will tell us which one you have. Please enter that here:

http://www.everymac.com/ultimate-mac-loo...

http://www.everymac.com/systems/apple/im...

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the first 2 leds are on the mac is a Apple iMac "Core 2 Duo" 2.0 17-Inch Identifiers: Late 2006 - MA590LL - iMac5,1 - A1208 - 2114 September 6, 2006 thanks

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Looks like a video or GPU failure. I'm not seeing if the GPU is integrated or on a card yet. Will try to find out.

Apple iMac "Core 2 Duo" 2.0 17-Inch Specs

Identifiers: Late 2006 - MA590LL - iMac5,1 - A1208 - 2114

http://www.everymac.com/systems/apple/im...

Video Card: Radeon X1600 VRAM Type: GDDR3

Details: ATI Radeon X1600 graphics processor using PCI Express. Has 128 MB of GDDR3 video memory.

Based on photographs

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from those whom have disassembled the iMac "Core Duo" and White iMac Core 2 Duo models, the video is soldered to the motherboard and cannot be removed after purchase, with the exception of the White iMac "Core 2 Duo" 2.16 24-Inch.

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Looks like Everymac says the GPU is integrated. Yu can going over it with a hot air gun and try to reflow it it.

http://www.everymac.com/systems/apple/im...

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@jacobpem besides all the great point that @mayer is making, try the troubleshooting first. Go through it step by step.

No Video

No Video, No Boot Chime, White LED ON (Symptom 1)

The iMac (17-inch Late 2006) will turn on (indicated by the front LED ON), but there is NO boot

chime and No Video on the display. The faint sound of the fans, hard drive, and optical drive may

also be heard.

1. Follow instructions in the “General Information” chapter to reset the SMC. Does the computer

display video after successfully resetting the SMC?

Yes: Problem solved.

No: Continue to next step.

2. Verify that only supported SDRAM memory has been installed and that it has been installed

correctly. Unsupported and/or defective memory can prevent the iMac (17-inch Late 2006) from

booting. It may be necessary to install known good memory for testing purposes and replace any

unsupported or defective SO-DIMM’s identified during this process. Does the computer display

video after verifying and/or replacing the memory with known good memory?

Yes: Problem solved. Verify full system functionality before return the system to the customer.

No: Replace the logic board.

No Video, Boot Chime heard, White LED ON (Symptom 2)

The iMac (17-inch Late 2006) will turn on, the boot chime can be heard, a white LED appears on

the front bezel and sounds from the fan or drive activity can be heard, but the display has no

picture or color.

1. Check if the computer is sleeping. Press the space bar to wake the computer from sleep mode.

Did the computer wake from sleep?

Yes: Put the computer to sleep from the Apple menu and wake the computer again to test.

Check Energy Saver setting to see when the computer has been designated to sleep.

No: Continue to next step.

2. Reset your computer’s PRAM (Parameter RAM):

If y -- our iMac is on, turn it off by holding the power button until the unit powers off. You

should hear the fans go quiet.

-- While the computer is off, with your left hand, hold down the Apple key, the Option key

next to it, and the letter “R” key on the keyboard. When you have these keys all pressed

down, push the power button with your right hand and then quickly move that hand

to hold down the letter “P” on the keyboard. Keep these four keys pressed while the

computer starts up.

-- Make sure you hold down the four keys (P - R - Apple - Option) while the computer is

starting up. When you hear the computer’s start up chime for the second time, you can

let go of the keys on the keyboard.-- If you didn’t hear at least two startup chimes, go to the top of this section and begin

again. It’s important that you hear two startup chimes when performing this procedure.

This indicates that you have successfully reset the computer’s PRAM (Parameter RAM).

3. Does the computer display video after successfully resetting the computer’s PRAM?

Yes: Restart the computer from the Apple menu and make sure the computer is now

working correctly.

No: Continue to next step.

4. Make sure the machine is powered off; power off the machine by holding in the Power Button

on the rear of the machine. Turn on the machine. Observe the white LED on the front bezel

during startup; it should go out after a few moments. Did the LED go off?

Yes: If the LED went off, this indicates that the main logic board has communicated with the

LCD display for video signal and your main logic board should be good. You can confirm by

connecting an external monitor and checking to see that you have video out. Go to Step 7.

No: Continue with the next step to reset system power management (SMC).

5. Follow instructions in the “General Information” chapter to reset the SMC. Does the computer

display video after successfully resetting the SMC?

Yes: Press and hold the power button until the computer powers off. Start the computer

again and confirm that front LED is reliably going off. If the computer still has no video but

the LED is reliably going off, continue with step 7.

No: Go to the next step.

6. Unplug the iMac and remove the SDRAM. Replace with known good SDRAM. Plug the iMac

back in and power the unit on. Does the front LED go off after a few moments now?

Yes: Replace the original SDRAM and test again. If the front LED does not go off with the only

the original SDRAM installed, replace the SDRAM. If the LED is now reliably going off after a

few moments, but yet you still do not have any video, go to step 7.

No: If the LED remained on, the main logic board is not communicating with the LCD panel

to generate video. Replace the main logic board.

7. With the LED going off, you may have a No Backlight condition or an LCD failure. In a dim room,

turn the display at an angle to you and look closely at the display. Is the display completely black

or can you see a dim, purplish light or glow to the display?

-- Completely black: Replace the inverter

-- Dim purplish light or glow: Replace the LCD panel.

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@oldturkey03 I did not see this trouble shooting guide listed for this machine. Does a link need to be added to the machine description here? https://www.ifixit.com/Device/Edit/iMac_...

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@mayer it's from the tech guide

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jacob pemberton will be eternally grateful.
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