One of my Macbook Pros can no longer print wirelessly to my HP 8100

Before I had AT&T U-Verse installed yesterday, I was using AT&T DSL.  I had an Apple Time Capsule that I had attached my HP OfficeJet Pro 8100 to via USB.  We have 2 Macbook Pros and they were able to print wirelessly to the 8100.  When the technician finished with the U-Verse install he tried to connect my 8100 via an Ethernet cable to router (NGV510) since their router had no USB connection like my Apple Time Capsule.  Nothing worked, couldn't figure out what to do.  He put my Time Capsule as a bridge device to the AT&T router (I don't know what that means, but I have 2 networks now-- one is my original network name on Time Capsule and the new one is from the AT&T router).  The Ethernet connection for the printer still didn't work. We connected the 8100 back to the Time Capsule via USB.  One of the MacPros could print wirelessly, no problem.  The other one couldn't.  
I have been on the HP website, but am not a network tech., so I am having problems understanding what I need to do.  Yesterday the AT&T guy told me to delete the printer, which I did, but I couldn't find a printer to re-add.  Today I went through the HP site and tried the process of attaching the USB printer cable to my Macbook and re-booting.  It found the driver and was added.  I tried running the Set Wizard, but it evently said it couldn't find the printer.  I tried it with USB printer cable attached to my Macbook and without.  Neither way worked.  
I am not sure what to do at this point.  I did notice on the Macbook that can still print, there is [1BEEF5] behind the printer name, which does not appear on my Macbook printer name.
Any assistance would be appreciated, since AT&T says this is wireless connection problem and it is not their problem.  They will try to fix it if I want to pay more money them for wireless support.  What a scam!! You have a network that works and then they install their new product and break my connections and what me to pay more money to them to fix it.  NOT GOING TO HAPPEN !!  I wish I had never done this install.  Terrible support from AT&T.

Hello there! Welcome to the forums @jdm2stl 
I read your post about how you are having some difficulties connecting your Officejet 8100 to your Macs, over the network and USB, as neither seem to be working.
I will do my best to help and make good suggestions to you to see if we can get through this for you.
First, I would suggest this certain troubleshooting guide for the printer not being found:
'Unable to Find Printer' Error Message Displays for the Officejet 6100 and Officejet Pro 8100 Printe...
Another possibility, would be the actual router settings, as this was the device that had been changed. Check your router settings, here is what you are looking for:
Network name and password to have no spaces or punctuation.
If using WPA2 security, switch to WPA personal.
Dual broadcast Wireless b/g/n (printer may only connect to g).
Mac filter needs to be turned off.
Firewall settings need to be at there default settings, or set to a lower security.
Multicasting "on".
Following ports need to be un-blocked:
Incoming (UDP) ports : 137, 138, 161, 427
Outgoing (TCP) ports : 137, 139, 427, 9100, 9220, 9500
If all of the router settings are correct and you still cannot install the printer on your Macs, respond to me with which Mac OS X you're running on the Macs and we can go from there.
Have a great Thursday
R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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