This Could be an issue because of the bad cartridge. Did you try to Remove and Reinstall the Cartridge? Try to remove the Cartridge and clean it up and try to re-install it properly . If it is not working properly try to change the cartridge. Because may be sometimes the ink may not be supporting. Still having the problem? Get your phones and call our HP Customer support team at the toll-free number +1-855-602-1890 and get the proper help and fix your printer in minutes. If you have any [https://www.123-hp-com-envy.com/hp-envy-4520-printer-problems/|HP Envy 4520 Printer error] you can get in touch with our site and get more useful information and troubleshooting techniques.