They're pretty much standardized, but be careful with Compaq/HP stuff... Apparently (or so I hear), they've done some pretty evil and/or stupid stuff before... This is hearsay, but apparently Compaq designed a (desktop) system in such a way that using anything but their official replacement power supply in it would fry its motherboard and the power supply-- and if you used the power supply for that model in another computer, the same. So, as a result, using either that particular power supply or that particular motherboard with another motherboard/p.s. would result in fried equipment. All the connectors were standard.