The only question mark is what kind of video card he has. Apple has a proprietary video card connector that they only really used for a couple years in the G4 days called ADC - Apple Digital Connector. It's basically a DVI port with USB ports and Power all in one cable. A great idea, but it makes connecting other monitors a real bitch.
If I recall correctly, every card that had an ADC port had a VGA port as well, but I could be wrong. ADC can be adapted to DVI, but I don't know if ADC supports DVI-A (analog VGA over DVI, like every other video card supports).