Chosen Solution
A friend gave me an iMac 17" (Late 2006 CD) EMC: 2114 and it can’t start. I connected the power adapter and something sounds inside (like a clicking sound), then I pressed the power button and nothing happened. I opened it to check the diagnostics LEDs (It have 3 LEDs). When I connect the power adapter the #1 LED was on, when I pressed the power button the #2 LED turned on, but the #3 LED just blinked once. Up to here, nothing seemed to be turned on. Then I kept pressing the power button (force shut down) and the #2 LED turned off. I tried once again. I quitted the power adapter, waited 15 seconds and then reconnected it while pressing the power button and the same clicking sound appeared. The #1 LED turned on. I pressed the power button and the LEDs did the same (#2 was on and #3 just blinked once), and this time the fans turned on, but neither the HDD nor the CD nor the screen seemed to be turned on. Neither sound was heard. Someone told me is both the power supply and the logic board which are the ones to be replace. I quit the power supply and it looks good, the computer doesn’t smell burnt. What do you think?
LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly. 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 LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated. LED 4 lights only if the computer detects an over-temperature condition. This LED will be OFF when the computer is turned on and running at the correct temperature. Inspect the 24 capacitors for bulging and/or corrosion. There was also a GPU problem on this one. The solder joint failed as the machine heated up and this can sometimes be repaired with a solder reflow. Take a look and let us know what you find.
