There might be no issue with the ink cartridge or the sheets placed. But any print jobs that are pending may be causing your HP 3755 Printer to not respond. To clear them, please run the Print Spooler program. Search for “services.msc” and find this program in the opening list. Visit its properties to stop the pending print jobs.
Ensure whether this fix worked or you may go to: https://www.errorsdoc.com/hp/fix-hp-printer-not-responding-issue/