Pink and orange plugs or pink and orange sockets??
Normally the earphones (speakers) would go into Green - and the mic into Red
Are you plugging into a sound card, or sound on the motherboard?
Is this on the front of the PC or the rear?
Some motherboards with surround sound, and only three sound sockets, need reconfiguring to make one of the sockets a mic - do you have this type of motherboard?