Q: my mackbook pro  does not boot and asks to  insert disc

Alexander, I would first do a SMC Reset and PRAM.

MacBook Without A Removable Battery

1. Shut down the computer.
2. Plug in the power adapter.
3. On the built-in keyboard, press the Shift, Control, and Option keys on the left side and the power button, all at the same time.
4. Release all three keys at the same time.
5. Turn on the computer.

Resetting PRAM

1. Shut down the computer.
2. Press the power button.
3. Before the grey screen appears, press the Command, Option, P, and R keys at the same time.
4. Hold the keys until your computer restarts and you hear the startup sound a second time.
5. Release the keys.

After you reset the PRAM, you might notice that some of your settings have been reset—things like the time, the volume, mouse settings and keyboard preferences, and other things like that. If you remember your previous computer settings, you should be able to get it back to normal in just a couple minutes.

If the above 2 options don't fix the problem, I would reinstall the OSX.  To do this, you have to press and hold down the Command + R at the start up chime.  Be patient!!!  You will see the Apple and if you wait long enough, a "Welcome" screen in multiple languages.  Select English and press continue.  At this window, you have the option to reinstall the OS X, or if you have  a TC back-up, you could probably reinstall it from there as well. 

I've included the below link for reference.

Startup key combinations for Mac - Apple Support