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iMac 21.5” does not power up, no chime is heard. I know that LED codes are: LED 1 on= trickle voltage from power supply is detected by logicboard. LED2 on= logic board has detected proper power from the power supply when the computer is turned on.
The problem is BOTH LEDs 1 and 2 are BLINKING (not ON continuously) when I connect the AC power cable to the mains wall socket. What problem does this point to?
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What does the other LED’s telling you?
Did you try reseating the RAM? Did you replace the RAM you might have a bad SO-DIMM.
这个答案有帮助吗？
The RAM is permanently soldered to the logicboard in this model, and cannot be replaced.
Dan, when I press the power button, the 2 other LEDs remain unlit, #1 and #2 LEDs turn off. When I release the power button, LEDs #3 and 4 remain off and #1 and #2 start to blink again.
@Bernie - Sorry your right! One of the few iMacs with soldered RAM.
I think your logic board is blown then.
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Can you offer some additional details on what preceded things here.
由 Dan 完成的
Nothing unusual happened prior to. Thing just suddenly won't turn on.
由 Bernie 完成的
Where is the light coming from?
由 Ben Capehart 完成的
Light comes from the vertically arranged LED array on the logicboard.
由 Bernie 完成的