Cannot turn printer off, pc reboots

[NM]

I am having a strange problem. I recently bought this canon i320 printer. My
OS is Windows 2000. I have installed the driver supplied by canon. I can
printout with no problem. There are two way to turn off the printer. One is
the hardware swith in the printer itself and the other is from
printer->properties->maintenance->trun off printer. I have tried both and
the same result. Within 4/5 second of turning off the printer, my pc
reboots. I have no idea why this is happening. Any input is appreciated.
By the way, I have two usb port in my pc and one is connected to a HP usb cd
writer. The other is connected to the printer. I have also a digital camera
which I connect to the second usb port. And now I remember that whenever I
just turn the camera off or disconnect the the camera cable my pc used to
reboot. Now I have to go to add/remove device and shut the usb mass storage
off and then turn the camera off or disconnect the camera cable.

NM

 

[Deathwalker]

so its not the printer then its the usb controller?simple diagnosis is to
connect these devices to another machine and see if they force reboots. use
the same cables too.