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Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Why my computer has 9 beeps and the display led doesn’t turn on

i bought a broken imac from 2007 and when i turned it on it make 9 beeps when i opened it i realized that only three leds were lit except the led on the LCD how can i fix this problem?

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1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable.

You are most likely hearing a series of 3 beeps a pause then 3 beeps, a pause, then 3 more beeps

Check the RAM modules to make sure that they didn't become dislodged. There is a possibility that the DIM slots are very dusty too. Try blowing out all dust from the computer.

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I already did it but it didn’t work .

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Interesting, never knew about the 2, 4 and 5 beeps. I'm assuming the latter is for iMacs where you can replace the processor.

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9 beeps in an SOS pattern (. . . _ _ _ . . .), a pause, then it repeating again usually means the EFI ROM is corrupted and the computer is in EFI ROM recovery mode. Give it a good hour to try and let the computer save itself.

If you think you’ve waited long enough and it still hasn’t done anything, since you have a pre-2011 Mac, you should be able to replace the chip containing the EFI and the EFI ROM. I have no idea where to get one, unfortunately.

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