When your print jobs get stuck in the print queue try the below listed possible solutions for 123.hp.com:
Open the Print Spooler and click Restart.
Disconnect the power cord from the 123 hp printer setup. Reconnect it back after a while and attempt printing.
If your connection type is USB photosmart printer connection, then disconnect the USB cable. Reconnect it back after a while and attempt printing.
Attempt resolving the issue using 123HP PRINTER Print and Scan Doctor.
Attempt printing after unchecking both Pause Printing and Use 123 hp printer Offline in the print queue window.
Attempt printing after setting your photosmart printer as the default 123 hp printer under Devices and 123 printers.
Disable your system firewall and then attempt printing. If the problem remains unresolved, re-enable the firewall and proceed to the next step.
Go to Devices and printers and remove your 123 hp setup from the list. Re-install your 123 Download printer software after you restart your computer and then attempt printing.
Try printing from another application to make sure that the problem doesn’t lie with the application you were earlier attempting to print from.
HP Printer Support