the other day ,
i met new problem with hp laserjet c4700 color printer.
suddenly the printer starts to print black and white on whole network.
so i replace the mainboard of the printer but no help.
after hours of digging.
i realized the xp computers work fine on the same network.
i started to reinstall some printer drivers from hp web site. there is only one driver is working.
i wasted many many times to replace the driver for every window7 computers.
Please stop the stupid microsoft's updates!