3 short 3 long 3 short beeps on start up
After looking on here it could be Efi rom or power supply inside computer. Cam I fix it myself? And if so how? Is it complicated?
Is this a good question?
S-O-S (3 short - 3 long - 3 short) is the systems firmware failure.
Not sure there is much you can do to fix this your self. Apple has EoL this model so getting them to help you recover the firmware will be difficult.
You could replace the logic board with a working one. There are a few outfits that can reprogram the firmware EEROM but you would need to swap out the Atmel chip which is a bit of work.
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