Help require about HP1015 printer

Dears;

I have a HP1015 printer. A problem appeared with it that when I send prints to it, system shows that print command has gone as when i click the printer icon, the documents is shown pending for printing but print doesnt start. If I click the green button of printer, test print comes out without any problem. Its mean printer is ready then why it doesnt start printing if print command has gone. Please help me out.