hp photosmart 3210 all-in-one network issue

i have a hp photosmart 3210 all-in-one setup for use on my network. i just
started having issues with it. on my main PC its setup via USB, but on all
my other PCs its connected to them through the network. its setup as a UPnP
device. when i originally got it, it appeared to all the PCs properly
through the network and appeared in "my network places". now its not
appearing in "my network places" or anywhere else, yet i can still access it
through IE when i type in its IP address. now i only can only use it via USB
for printing and stuff. does anyone have any ideas to fix this issue so that
i can get it working through the network again?