Q: Macbook Pro Three Beeps on Startup even after RAM replaced
Hi folks,
Well this one has got me bamboozled. I'm working on a Macbook pro 15 A1278 for a friend. They were given the computer by someone who didn't want it. My friend did not have the password to get into the machine and no original system disc. I thought this was going to be an easy case of erase-and-install. So I attempted to boot from my own Snow Leopard DVD, then I started getting three beep errors.
Now I can't get as far as the password screen any more. Computer starts with normal chimes, then when it gets to the grey screen with the Apple, I get the "three beeps". Bought new ram, put it in, reseated it a bunch of times, still three beeps every time.
Attempting to restart using the system DVD by holding the C key, same problem. DVD spins up but then three beeps.
Fired the machine up as a target disk and ran disk utility via remote control from another machine, we''ll call that one "machine B". Hard drive checks out with no errors and is formatted in Extended Journaled. Did a clean system install from machine B (while still in target disk mode). System install was a success and was able to restart machine B successfully from the hard drive of the faulty machine.
I don't get it.... any takers? Many thanks, Alex.
MacBook Pro, Mac OS X (10.6.3)
Posted on Feb 27, 2012 7:17 PM