I bought a new ASUS laptop a few days ago and realised that the headphone jack may not be working properly. The headphones themselves work (I've checked on my ipod) but they are not being registered by the laptop when I plug them in. I've checked the device manager in the control panel but the only devices under audio are the speakers. When I plug the headphones in, they are 3/4 of the way in, sticking out quite a bit and looking like they're not plugged in all the way. I've tried pushing them in further but I'm afraid to damage the jack. The headphones are 3.5mm, but I can't find the size of the jack anywhere to see if it's simply too small. Any advice?

Thank you!