No the OSX version on the disk is the lastest OS version and the version on my tower is OSX that came with it. I have unplugged all of the USB items, I have plugged my laptop and tower together with a 6 pin to 6 pin cable, starting the laptop holding the T key down, inserting the disk into the laptop, starting the tower holding the option key and selecting the disk as the startup system, and nothing worked. The laptop works perfectly. I updated the OSX on it using the same disk and had no problems. But the disk just sat and spun with I tried the above scenario. Any ideas?