I have Windows 10 .0.17134 on an Acer Aspire ES1-512 laptop. When I plug in my external speakers, it functions just fine, but when I unplug them and just try to use the internal speakers, absolutely nothing comes out. I've tried everything, including troubleshooting, disabling all sound effects, and nothing seems to work. It doesn't make a lot of sense. Obviously my sound card is working. Any ideas? Thank you for any help.