All of a sudden my printer will not print from my computer. It will not connect to wifi.

[Glenda47]

I have a HP DeskJet 4100 All-in-one wireless printer that will not print from my laptop.  The blue light flashes to show that it is not connected to my internet..  I have tried turning off the router and turning it back on and several other things. 

PLEASE HELP 

[A_Gayathri]

Hi @Glenda47,

Welcome to the HP Support Community

I understand you are facing an issue with your wifi issues HP Deskjet 4100e wireless connection issue Not to worry I will help you to get a resolution to resolve the issue.

To assist you better:

• How far is the printer located from the WiFi router?
• Do you have a dual-band router?
• If you have a dual-band router and both 2.4GHz and 5GHz networks share the same name/SSID, the printer will not be able to connect to the network. In this case, contact your Internet service provider to assign different names to both networks

While you respond to that, Let's perform a power drain: 

• With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
• Remove the USB cable, if present.
• Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
• Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord (This is important) and then plug back the power cord to the printer.
• Turn on the printer and wait till the warm-up period finishes and the printer is idle

 HP DeskJet 2700, 4100, 4800 printers - Blinking lights and error codes

Update the printer firmware 

• Click here to download and install the latest printer firmware from your product
• Click here to know different methods of updating the printer firmware.

Please follow the below  document 

click here and follow the troubleshooting steps- HP printer setup (HP Smart app)

click here and follow the troubleshooting steps- HP printer setup (Wi-Fi network)

click here and follow the troubleshooting steps- HP printer setup (Windows built-in driver)

click here and follow the troubleshooting steps HP printers - Wi-Fi connection is lost after a router or network settings change

click here and follow the troubleshooting steps  Troubleshoot a Wi-Fi connection to an HP printer 

click here and follow the troubleshooting steps Find the wireless network password or PIN to connect an HP printer

uninstall the printer drivers from the device manager and reinstall  printer drivers

If the issue persists, then please follow the steps mentioned in this document:

Use HP Print and Scan Doctor to check connectivity Only for Windows

Download a special version of HP Print and Scan Doctor specifically created to help with printer offline conditions.

1. Download HP Print and Scan Doctor.
2. Run HPPSdr.exe from the download location on your computer.
3. Once HP Print and Scan Doctor opens, click Start, and then select your printer.
• If your printer in not in the list, turn it off and on, and then click Retry.
• If there is a connection problem, follow the instructions in HP Print and Scan Doctor.
4. If a screen prompts you to turn on printer updates, click Yes.
5. If a screen prompts you to make your printer the default printer, click Yes.

Hope this helps! Keep me posted. 

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