Epson Stylus NX420
My Mac says that the printer is not connected, but I was able to print wirelessly before I moved the printer to another spot.

How to Identify and Fix Common printer Problems ?

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Connect your product to your Mac using an Ethernet cable and make sure the product is turned on. Go to the menu on your Mac, then select System Preferences. Select Printers and Scanners, Print & Scan, or Print & Fax.
The interface cable may not be plugged in securely. Check both ends of the interface cable between the printer and the computer. You may not be using the correct interface cable. If you are using the USB interface, use a Revision 1.1 or 2.0 cable.
System Restart

Just shut down your computer or laptop. Remove and disconnect all USB connections. Turn on your computer and connect the USB cable to the Epson printer after waiting 3-5 minutes. The “Epson printer communication issue” is commonly resolved by rebooting the machine.

Make sure you have the latest software

On your Mac, to find out which version of printer software you`re using, choose Apple menu > System Settings, then click Printers & Scanners in the sidebar. Click the printer in the Printers list on the right, then check the Driver version.

Do a hard reset on your printer. To do this you just need to turn off your printer, unplug for a few minutes and then plug the printer again. If that still doesn`t work, try turning the printer and your computer off, and then start it back up again. Try uninstalling and then reinstalling your printer driver.
Click the start button, and then select Epson Software > Epson Printer Connection Checker. Enter the application name in the search charm, and then select the displayed icon. Click the start button, and then select All Programs > Epson Software > Epson Printer Connection Checker.
If your printer and router both support WPS push-to-connect, simply push the WPS button on your printer, then press the WPS button on your router within two minutes. The connection will be made automatically. Some older wireless printers may require you to connect to a computer first to set up the wireless connection.
A connection to the printer could not be made. The printer may be offline, malfunctioning, or busy. Verify the following items, and then resubmit your print job: Confirm that the printer is powered on and displays Ready.
Start by checking your hardware

If you`re using a wired printer, make sure that the printer cable is properly connected from the printer to your PC. For wireless printers, check the wireless connection. Make sure the printer`s wireless option is turned on and available.

Power down the printer and disconnect if it`s connected to your Mac via a cable. To re-add the printer, power it back up. The printer may appear in “System Preferences -> Printers & Scanners” automatically. If not, click the “+” button and follow the instructions to re-add it.
Support. Epson scanners come with universal Mac support and industry-standard USB connectivity to ensure a seamless experience right from the start.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My on and ink/paper buttons are flashing alternately , my Mac tells me I can not print as it is a communication error .
ANSWER : to flashing lights again. I have looked at the some say it’s the ink pads! But tried to use the download for reset but my print tells me communication error!! Someone can you help?

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Epson Stylus NX420

SSC Utility and Mac Users
ANSWER : How about resetting the chips using a chip resetter? They are sold on the internet in the $5 range. You just hold the cartridge against it until it turns green.

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Epson Stylus NX420

Cant open HP Director in my mac
ANSWER : Try reinstalling it first from the CD and if that fails again, try downloading the software package from the official HP site and attempting an install that way. Apple makes it a pain to uninstall programs but doing an install on top of the existing one without first uninstalling could repair the issue. If you must uninstall the software there are programs that help uninstall programs from Mac systems.

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Epson Stylus NX420