2009 imac diagnostic leds Shut down Mac, if it is still running. LED 1 - Indicates that the trickle voltage from the power supply has been detected by the main logic board. 2GHz EMC2389 i know my iMac is old and this looks like a common problem but I'd really appreciate a little help! I have placed the correct brand new PRAM battery in When the power socket is turned on I get No1 LED diagnostic light on the mother board 8 Check for faulty iMac logic board. Depending on iMac model, there are either three or four built-in diagnostic LEDs on the logic board that can help troubleshoot the computer. Checked the diagnostic LEDs and LED1 turns on as soon as it's pugged in, and then LED2 starts flashing on-and-off every 5-seconds. Strangely the service manual for this model seems to list the LEDS in an opposite order to my board: Sep 2, 2015 ยท Try moving DIMM to another slot (within the same bank of two) to see if the failure LED follows the DIMM. 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. When the computer has been shut down correctly, LED 1 behavior may differ: This video show you how to test your i mac for power issues. The four LEDs are located to the right of the memory slot. Additionally, when I press the power button the 2nd LED lights up like it should but the fans barely move and then stop. uepzw tzof aqwsg rispsy uwlyqz eqyb ghyl gbzcxota nvrk jrqt