![]() Run Software Update to get 10.6. Restart the 17' with 'ALT' key pressed to start up from the 2010 Macbook's HDD 3. Install SL on it in Target Mode on the 2008 17' 2. If your Macbook Air or Macbook Pro computer refuses to start, this article will list the steps to follow in order to overcome this problem. Anyway it is a well documented process - Just google 'macbook 3 beeps installing Snow leopard' without the marks it will be in the three top hits 1. The update will be done automatically, you don't have to do anything. One long beep when the Power button is pressedÄon't worry, if your Macbook Air or Macbook Pro computer emits a long tone when the power button is held down, it simply means that an EFI ROM update is in progress. Your Mac will automatically shut down at the end of the process and restart on its own when the ROM is repaired and functional. Please do not try to shut down or manipulate your Macbook Air or Macbook Pro computer during the ROM restore process. A progress bar will then appear on your Mac screen during this recovery operation. On newer Macs, the ROM is automatically restored. If your Macbook Air or Macbook Pro computer is broadcasting three long tones, three short tones then again three long tones, it means that the EFI ROM is corrupted and your Macbook Air or Macbook Pro computer is trying to restore. ![]() Three long beeps, three short beeps, and three long beeps on a Macbook Air or Macbook Pro computer ![]()
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