Cannot answer with a solution I’m afraid but I have an A1311 whereby the number 1 LED illuminates momentarily when the power cable is applied.
Have swapped the PSU already but still unresponsive.
Any advice?
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Paul Scarbro right now it means your system does not power up. You replaced the PSU now time to check further. Check these
LED Startup Sequence
LED #1 = Power available.
If no LED is visible:
• First disconnect the AC cable from computer, then reconnect it to reset the LED status,
in case computer was correctly shutdown and AC was kept connected since
• Verify AC source
• Verify known-good AC cable is connected
• Verify cable connection between AC inlet and power supply
• Verify cable connection between power supply and logic board
• Verify power supply
LED #1 + LED #2 = Power available, and system is powered on.
If second LED is not visible when power button is pressed:
• Verify power button connection to logic board
• Verify power button functionality
• Verify cable connection between power supply and logic board
• Verify power supply
• Verify logic board
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