I have 2 white macbooks to erase them, HOW please

Question

I have 2 white macbooks. lets call them M1 and M2
so I have M1 and disk for it and have M2 and NO disk for it.
I took disk1 and put it in M2 to erase it, restart - installer, I chose machintosh main harddrive and erased it, then I tried to reinstall the OSX and it gives me an error(MAC OS X cannot be installed on this computer) WHY? plus I cannot understand how the fck I get the disk out of this computer now. I am trying upper right button eject and it won't eject. I did try command + E and no luck either.
So my question is, how to take out the CD and how to install any OS on this macbook so I can sell it. and then I need to do the same thing with the second one too.
and there also option to start from network and it just restarts and thats it, not asking any question and doing nothing
PLEASE HELP! first time mac user =(

Answer 1

Because M2 must have a different version of OS X that the M1 disk installs. Typically, that would be interpreted to mean the OS X on the M1 disk is an earlier version than required by M2.
Five ways to eject a stuck CD or DVD from the optical drive
Ejecting the stuck disc can usually be done in one of the following ways:
  1. Restart the computer and after the chime press and hold down the
      left mouse button until the disc ejects.
  2. Press the Eject button on your keyboard.
  3. Click on the Eject button in the menubar.
  4. Press COMMAND-E.
  5. If none of the above work try this: Open the Terminal application in
      your Utilities folder. At the prompt enter or paste the following:
        /usr/bin/drutil eject
If this fails then try this:
Boot the computer into Single-user Mode. At the prompt enter the same command as used above. To restart the computer enter "reboot" at the prompt without quotes.