Ubuntu problems on Macbook
So, yesterday I installed ubuntu on my Macbook, I removed all the partitions and made only one for Ubuntu, so I don't have OSX installed anymore.
I used it for a while and noticed the battery doesn't last as long as on OSX, so I tried some fixes from askubuntu.com and now it's kinda ****** up and I just wanted to reinstall ubuntu, or install OSX or lubuntu.
The problem is I can't access rEFIt anymore, if I create a bootable USB it just won't boot from it, and inserting the OSX install DVD does nothing, it won't boot from it. Sometimes grub bootmenu shows up but I can only boot ubuntu from there. I tried the command+option+O+F shortcut after turning the macbook on but it does nothing.
What can I do? I probably just want OSX back