Actually it is a computer here at work. I know PCs pretty well, but I am lost when it comes to Macs. It was booting up for a while, but now it just shows the arrow cursor in the corner. It will move with the mouse. I don't know what OS was on it. When booting up I listen to the HDD and it spins up , and then spins down a bit. I thought the drive might be bad, so I found another Quantum Fireball on Ebay. Where can I get an OS to put on and how do you install the OS? Is it like a PC? I do have a version of OS 9.0.4 but it won't install on the new drive. Any help would be greatly appreciated.