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Can adb start my android device that shows up as "offline"?

I can see my device in adb devices. It shows up as "offline". When it is "ready":

$ adb shell
$ su
# reboot

This would reboot my device. The exact problem is that my cellphone has been turning off on its own with no specific reason, so I was wondering if I could check the logcat to see the problem. I cannot start my device, I have to remove the battery and then start it, and when I do the log is empty... But my questions here are:

  • If adb can detect my device why can't it reboot it?
  • Why can't I turn on my android device from adb when I can reboot it?
  • What does offline mean: is it turned on or not? (when it isn't usually it doesn't even show in adb devices)