My Mac Pro boots into recovery mode every time it boots up. I have to select the start-up disk when in recovery mode.
How can I make so it starts up in Mac Os X Lion every time without it going into recovery mode?
The startup disk system preference is the usual method to set this. As the setting is written to NVRAM, you could also just reset that and the mac should prefer the OS over the Recovery HD
If you can't select the Mac OS X, re-run the lion installer.