2nd headphone jack on Dell inspiron 1420 does not work?

Hi, I have a laptop Dell inspiron 1420. I found that the 2nd headphone jack does not work while the 1st headphone jack and the internal speaker are working. How can I fix it?

Thanks you.2nd headphone jack on Dell inspiron 1420 does not work?It sounds like you might need A: A driver update; B: to check your settings; or C: A phone call to Dell organizing a repair. The drivers are located on the Dell website under support, try installing them and see what happens. Otherwise it might just be a setting you need to fiddle with, check the audio options on your computer. Finally, you might just need to call Dell for some customer support or to organize an on site service.