Hey, i have a mac mini and a powerbook, the man mini has been running fine since i purchased it and still does, HOWEVER, i just purchased a midi dj controller (nu mark stealth control) and my current problem is that all the available dj software that will work with it, requires 10.4 and i do not know how to upgrade, i have spent a bit of money on the dj equipment and don't have any more to spend...if someone can please offer some help/advise it would very greatly appreciated