Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Loop chime diagnostic leds 1 and 2 on

Hi everybody.

I've got iMac EMC 2210.

After boot iMac enters to endless chime loop (1st is chime after DVD's try boot sound and reboots again), diagnostic leds 1 and 2 lit, 3 and 4 are off. Is it means graphic card and inverter are dead or just graphic? Cables are good. Past thermal was changed on gpu+pads and cpu. If graphic is dead ATI Radeon HD 2400 XT there's possible to find schema electronic or some info how to test card for shorts circuits?

Thanks for help

Greets

Answered! View the answer I have this problem too

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To test your video card, hook up and external monitor, I you get a picture the card is good.

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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Thanks for respond.

I know the signification of LEDs.

I used Hot Air on graphic card. Now iMac boots but LEDs 3 and 4 are still off. Maybe I'll try oven 200C 8min or someone else has another idea.

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