So I have two G4 Cubes and got the first up and running. My second one used to run fine, but then I put a Tiger disc into the messed up drive and it got stuck in there. I wasn't able to boot from the hard disk or the Tiger disc. I tried to use Target Disk mode with another Mac so I could install the OS that way, but the computer wouldn't enter TD-mode. It remains unresponsive and ends up just showing the flashing question mark. I tested the freshly-formatted hard drive in it to be working fully. I thought that the disc drive may have been interfering, so I removed the drive altogether... still no response from the machine to go into Target Disk mode. I force-ejected my other Tiger disc that was stuck in the drive, and haven't put the drive back into the Cube. Could the fact that the drive is now disc-free help? Because I have yet to test it again with the now-empty drive. I don't know, but this machine feels bricked to me. I don't understand what is going wrong with it. The keyboard turns on at start-up but the computer doesn't respond to my command. I have a strange idea of maybe just installing Tiger on the hard drive itself then sticking it into the computer and booting from it. I guess that may be the only way to fix it. I assume that the hard drive will adapt to the new-to-it computer's specs? I guess I will try that and then update my forum post as to whether it worked or it didn't.