Zum Hauptinhalt wechseln

Model A1224 / Mitte 2007 und Anfang 2008 / 2, 2.4, oder 2.66 GHz Core 2 Duo Prozessor

548 Fragen Alle anzeigen

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?

Beantwortet! Antwort anzeigen Ich habe das gleiche Problem

Ist dies eine gute Frage?

Bewertung 0
Einen Kommentar hinzufügen

1 Antwort

Gewählte Lösung

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

  1. Choose Apple menu > Shut Down.
  2. After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. ...
  3. Release all keys.
  4. Press the power button again to turn on your Mac.
  5. UPDATE
  6. I would bet on it being the inverter:
  7. iMac Intel 20" EMC 2133 and 2210 Inverter Replacement

War diese Antwort hilfreich?

Bewertung 3

1 Kommentar:

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.

von

Einen Kommentar hinzufügen

Antwort hinzufügen

Barry OToole wird auf ewig dankbar sein.
Seitenaufrufe:

Letzte 24 Stunden: 0

Letzte 7 Tage: 0

Letzte 30 Tage: 0

Insgesamt: 68