Sound not coming out of speakers

my speakers won't play any sound, the device seems to have disappeared somewhere else in my system. When I troubleshoot I get "the device is working properly" yet when I try to play a sound manually, it says there is an error. I have Manhattan (finest quality computer products). Please help....

I have troubleshooted every way possible. Nothing works, my system tells me that the device is working properly but I still can't get it to work