casondemand.blogg.se - Macbook pro 3 beeps power off

And Yes, it’s trying to tell you something!Ī looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware. Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3. Mac OS X El Capitan 10.11.6 installed on the internal drive.

The Mac boots fine otherwise (both normally and in Safe Mode), but just doesn’t want to boot from this disc and I have no idea why, but I’m pretty sure the beeps are the key! 🙂 Specifications: I have no reason to suspect a problem with either the disc (no scratches or other signs of damage and it boots a Mid 2009 MacBook Pro just fine) or the optical drive (it loads other discs fine). To do this I am trying to boot from an original Snow Leopard disc in the SuperDrive.

Is my Mac possessed? Assuming not, what is it trying to tell me? Backgroundįor various reasons I want to re-install the original Mac OS X.

booted into Apple Hardware Test and no problems found after running extended tests.

used a timer to verify it is definitely 3 seconds in between the 3 beeps.

rebooted a number of times and the same exact pattern occurs.

checked with Apple KB – About Mac startup tones and this pattern is not listed as an official form of communication.

They beep as follows:īEEP BEEP BEEP BEEP BEEP BEEP and it continues until I power off.

Hold the keys down until the computer restarts and you hear the startup sound for the second time.Ĭontact Apple for appt., for replacing your logic board and full in shop diagnosis, the RAM is permanently on the logic board, and the logic board would need to be replaced.When I try to boot my Mac I get nothing but strange beeps.

Press and hold the Command-Option-P-R keys before the gray screen appears.

You will need to hold these keys down simultaneously in step 4.

Locate the following keys on the keyboard: Command (⌘), Option, P, and R.

Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

Press the power button to turn on the computer.Release all the keys and the power button at the same time.On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.3 beeps means your RAM is bad on your logic board