SOS 9 Beeps (3 short, 3 longer, 3 short)
During the installation of High Sierra, after a restart my iMac now gives a SOS signal at startup.
9 Beeps (3 short, 3 longer, 3 short)
I tried the reset of NVRAM and PRAM and other relative keyboard combinations at startup without result.
I tried all 4 RAM modules one by one.
Do I need to replace a battery?
Do I need to restore firmware?
I hope that someone can help me
Is this a good question?