I have a Deskjet 2540 and all the lights are flashing and my PC won't recognise it.

[PDGB]

It is connected by a USB cable, I've never used wi-fi for printing.  There is a large E and the wireless emblem flashing on the printer screen.

[Nal_NR]

Hi @PDGB,

Welcome to the HP Support Community. 

I'd be happy to help you! 

I understand that you are having issues with blinking lights. 

This looks like a hardware issue, however, I recommend you follow the below steps and check if it helps.

1. 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. 
2. Remove USB cable, if present. 
3. Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge. 
4. 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. 
5. Turn on the printer and wait till warm-up period finishes and the printer is idle.

You may also refer to this document for further assistance. 

Let me know how it goes and you have a great day!

Hope this helps! Keep me posted for further assistance.

 Please mark this post as “Accepted Solution” if the issue is resolved and if you feel this reply was helpful click “Yes”.

[PDGB]

Thanks Elohi_NR for your reply.

I've followed the step by step guidance exactly but it doesn't make any difference, I still get flashing lights.

The document mentioned is not accessible either as my PC is flagging it as not secure.

Patrick

[Nal_NR]

Hi @PDGB ,

We apologize for the inconvenience, but it seems that the issue persists even after attempting the troubleshooting steps mentioned above.

This might require one-on-one interaction to fix the issue via remote assistance. 

I've sent you a private message with further instructions. In order to access your private messages, click the private message icon on the upper right corner of your HP Support Community profile, next to your profile Name or simply click on this link.

If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution button, that'll help us and others see that we've got the answers!