I have a 2006 Macbook (Black), Intel Core 2 Duo and 2GB RAM. Recently while cleansing the inside of dust with a hint of compressed air, I had removed the hard drive, the RAM, and the screws securing the case in place. Upon replacing all of the above I was met with the GRUB menu. I simply hit enter to select Ubuntu, but nothing happened.
I came across that the keyboard was not working. I know that the keyboard is not damaged, the power button works and it's on the same connection as the keyboard to the logicboard. I read extensively on how to enable my keyboard, and I attempted to use an external USB keyboard with no avail.
With out the BIOS readily available since it is a Macintosh brand computer, I cannot enable legacy USB support. With the CD drive enabled it automatically boots to CD over the hard drive, but again once asked to either "Try" or "Install" Ubuntu, the mouse no longer works and the keyboard is also inactive.
Could the problem here be software, or is it more likely hardware (torn ribbon)?