Sound out of headphone but not speakers
I have the Inspiron 5755, Windows 10, 2T HD, 12 GB of ram, 64 bit. A few days ago, a message started popping up on my screen saying that I plugged in a device, and then immediately it would say I had unplugged a device and it would do that over and over. Now I cannot hear anything from the speakers, but I can through my headphones. Every now and then I can hear from the speakers for a few minutes. I have tried about every suggestion that was posted about this problem on the internet, with no luck. Yes my drivers are up to date. Any suggestions? I've only had this since December 2015. Thank you for any help!
Someone said I could use external speakers but am not not sure what kind to use.