Nacho's got it on the nose. Try the qtip method first to loosen the dried ink...then...
Try going to your printer settings (from the control panel >> printers >> right click on your printer >> properties, and find 'maintenance' or 'cleaning' ...etc.
it basically uses a mode that squirts ink out, then washes the head, then squirts some more. My HP printer offers light, intermediate, and heavy cleaning - try that. It 'does' use a fair amount of ink, but if the head is fubar, you might as well try.
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. The ink has probably dried up in the jets, clogging them.
. You may be able to unclog it by using a Q-Tip (cotton swab) dampened with water on the ink jets, but don't hold your breath. You're probably going to need a new cartridge.
. That's why I switched to laser printers.