Desperate Laptop Speaker Problem

Ok Here goes,

i have a hp laptop with built in speakers, i know that they work as the speakers play systems sounds.i.e. start up noise. However, they do not play midi files such as a music video or song no matter what program i use to run it. I have gone through the troubleshooting steps on the computer and can not find a solution.

Could u please help me

Thanks in advance,
Chris

ybyav8