Laserjet P-1006 goes to sleep

we have a shared printer at office between 3 laptops which is coected to one of them. all of them has the same driver and same windows. when we're in the middle of the day, we send print, it works. but when we come back in the moing, we send print, it doesn't move a muscle ! everything is checked and everything is good. cables, windows, driver, all of them are checked. But, when i coect the cable to another laptop, it prints well. i coect printer to first laptop, it prints well again. after an hour of not printing anything, it goes to standby or something like that.

I digged deep in the inteet, but didn't find anything. You guys always gave me the solution. I know you wouldn't let me down.

Waiting for your solution. Thanks a lot