What model PC do you have? List your model number and someone can assist you and describe where the headphone jack is, if your PC has one.
I am not a Dell Employee
Dell forum member since 2002
Home Built PC with Gigabyte GA-Z77X-UD5H motherboard, i7 3770 CPU, Windows 7 64 bit Home/Win 8.1. SSD drive. Sonar X3c 64 bit Recordng Software.
Member of Nashville based R.O.P.E.
have you tried turning the speakers on or off (try both) before you plug the headphones in?
for more help, reply with the numbers on the front of the computer...we need to know what kind of computer you have to better help.