G4 quicksilver (2002) Dual 1 GHZ won't shutdown

I got a powermac G4 quicksilver dual 1 ghz 1 gb ram with a 60 gb hard drive and when I try to shut the computer down, it won't shutdown. I have an apple ADC display connected to it. What can be the problem? When I try to shut it down all it does is restart.

Have a look at this link, particularly posts at the foot of the page and hope it helps:-

http://discussions.apple.com/thread.jspa?messageID=7114380

I installed Leopard yesterday and it now shuts down. It must've been the OS that was corrupted or something. thanks for the help

Do the USB ports on the display work under Leopard by any chancve?

I will try tonite to see if the usb work. thanks harryb2448, your a genius

Any joy maconeforcer with the ports?