Pixie

I have a computer with built-in speakers. The sound used to work about five years ago, then I made some changes, I don't remember what I did, but the sound was gone, for all applications. I tried all simple fixes back then. I started working on my latop after that. But now I want to make a ppt with sound, and I want to give the file to somebody. Ppt is on this old computer. I want to make sure the sound works without headphones before I give the file away. So that's the long story ...

So, with headphones the sound works fine, without there is no sound. It used to have sound regardless of headphones, what did I do wrong? Thanks.