Cannot find wireless printer, Deskjet 2540 after we got a new internet provider

I  turned off the laptop, my ipad, my printer, even my router, still doesn't work. I went on the HP SCAN AND PRINT DOCTOR, it kept saying that cannot find printer.  Then I deleted the printer in my computer HARDWARE, try to search for the printer, it says cannot find printer.
I went on my ipad, my printer has a lock on it. But I don't know the password. 
Look like my printer still connected to the old net work. 
The printer work if  it is connected to the USB cable.
What should I do? 

Seems like the network has a password, or something along those lines, no? Maybe try restoring the printer to defaults to get that old password out of it if you cant rememeber it, adn then try connecting again.

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