Have a 4155. Have a blinking power button and yellow light below the screen with a blinking 0.

[jstreaz]

HP Deskjet Plus 4155. Blinking on/off button and yellow light below window. 0 blinking in the window. Replace both ink cartridges and black works fine, but no results on the color.

[Betty0610]

@Carl-Erik

Welcome to the HP Support Community.

I recommend you to contact the HP Support Team regarding this as this could be a hardware issue.

Link: https://www.hp.com/us-en/contact-hp/ww-phone-assist.html

Note:  Select the country accordingly to get the contact details for support.

Let me know if this helps.

If the information I've provided was helpful, give us some reinforcement by clicking the "Accept as solution" on my public post, that'll help us and others see that we've got the answers!

Thanks!

Have a great day!