suddenly lost printer connection but still have internet

DV6700US HP Laptop seems to have lost the wireless network connection. A sudden failure to print gave me a printer offline message. My iMac printed fine, then I realized my iMac could not see the laptop and the laptop could not see the iMac nor printer, but still has internet connection on the laptop. I now nothing about Windows 7. iMac is ethernet connected.
My network consist of an iMac (OS 10.6.8) with ethernet to the wireless router which also has the Samsung printer (SCX-3405FW) plugged in. Recently bought the printer and installed it. Tested it with the iMac and the HP laptop (DV6700US) (Windows 7 Home Premium) and all is fine for about two weeks. The other day went to print from laptop and printer queue showed "Error - Printer offline." Went to the iMac and it printed fine. All this time I am getting internet connection via the network. I then realized that the HP was not showing up on the network.
Checking the HP network shows the HP....modem........internet. Map all shows the iMac and the printer, at the bottom, but says "the following discovered devices can not be placed in the map"

 

Hi marmp and welcome to MGs.

First thing to do is shut down the entire network and reboot in sequence from modem to router to comps and printer while letting each piece sync up fully before booting up the next.
If the printer still does not show up, you may have to re-install it on the network.

No software changes recently that may have contributed to the problem?

 

Click on the Network Icon in the system tray and select Network and Sharing Center. Once that window appears look under "View your active networks". Directly under that it will show you what network profile you are using. (Domain, Home, Public) It should be set to Home, if it's not you can do so by clicking the icon.

If that doesn't work another thing you can try is from the same window, Network and Sharing Center, click Homegroup at the very bottom left hand corner and select "Change advanced sharing settings...". From here select the Home or Work profile and make sure that network discovery is set to On.

 

OK. Did that. I added a copy of the printer (Copy 1) and it works fine, just can't see either mac (iMac nor G5)