No 4th LED, No Tones
No boot up tones. LEDs 1 2 and 3 are lit and 4 is dark. Display is dark.
Some say it is the logic board and some say it is the power supply. Is there a way to narrow it down?
Ist dies eine gute Frage?
No boot up tones. LEDs 1 2 and 3 are lit and 4 is dark. Display is dark.
Some say it is the logic board and some say it is the power supply. Is there a way to narrow it down?
Ist dies eine gute Frage?
Hook it up to an external display to narrow down your diagnostic. If it’s what I think it is you should be able to shine a flashlight at an angle to the screen and see the desktop.
To see if you can get a tone again, reset the SMC
How to reset the SMC
War diese Antwort hilfreich?
I tried the reset and that didn't help. I am unable to connect it to an external display. There are still no tones and no low level image on the screen. This is an A1224 with a EMC 2133 and a 20" screen. built in 2007.
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