Problem with PC audio

So I am having some troubles with my onboard audio on my PC. I have zero sound when playing music, games etc… off of my computer. But i also have a Ion record player hooked up which plays music just fine. Everything runs through the same speakers. I have a 2.1 creative set up. I have re-installed the drivers and all the jazz and still no luck. Everything worked fine till i moved back to school and now its not working and im at a loss. so if anyone has any advice that would be great.