Slow OSX booting with black screen before apple logo

Every time I boot my macbook, there is always a black screen before the Apple Logo pops up. The blackscreen stays for around 15-20 seconds. How can I resolve that problem?


Solution 1:

It can happen, if you doesn't have selected a specific start-volume.

  1. From the Apple menu choose System Preferences.
  2. Click the Startup Disk icon in System Preferences, or choose View > Startup Disk.
  3. Select your startup disk from the list of available volumes.

After that, restart your mac and the blackscreen shouldn't appear before a start.