Can you tell us the model of your wireless printer?
As you are using an HP D110 we will first have to perform a firmware update on the printer so that it will then support the Apple airprint application.
To do this can you go to the printer and then press the setup button (looks like a little wrench) and then select Web then Automatic Updates and then select Check for Product Updates and let it then download and install the latest software for the printer.
Once it has updated itself can you then power up your iPad and then try to see if you can then see your D110 and then print to it.
Let me know how you get on
Can you go to the printer setting pane and then can you manually set the printer to a static IP address and when prompted can you enter the following:-
Subnet Mask 255.255.255.0
Once that is done and saved can you power cycle the printer then wait 2 minutes and see if your iPad will see the printer.
Also bear in mind that you may have to resetup your PC's or Mac's to see the printer again.
Let me know what happens
Were you able to set the printer to the static IP address I listed above?
If so can you tell me if your Computers will print to it or if they are having issues also?
Will your computers see the printer?
The reason I ask is so that I know the printer is on your network so we can tehn look at the iPad
Do your computers see the Printer and can they print to it?
Please answer this one question for me so I can know if the printer is seen on your network so that I know it is an issue with the iPad or the printers network connection
That tells me it is an issue with the networking not the printers network interface
On one of your Windows machines can you click Start and then can you type CMD in the run box then hit enter to open a DOS window, Or if you use Vista or 7 can you click start then type cmd into the search box at the bottom of the start menu then hit enter to open the DOS window.
When the window opens can you type ipconfig then hit enter and make a note of the Default Gateway address which should be something like 192.168.1.1
Once you have that can you let me know what it is?
Can you now type ping 192.168.1.240 and hit enter then tell me what it says?
Does it say timed out or replied?
Did you set the static IP on the printer like I posted earlier?
If not can you tell me what happened when you tried?
The reason I ask is that the Printer has to use a static IP address before the iPad will see it and use it for Airprint so setting a static IP is crucial to get it all working cleanly.