It sounds like the on-board sound card is on its way out, sound cards are pretty cheap. You should be able to pick one up for less than a tenner, of course that depends on the quality of the sound card that you want.
This thread is now locked and can not be replied to.
How to get Windows 10 for free | How to install Windows 10: There is still a way to avoid paying…
1995-2015: How technology has changed the world in 20 years
Alex Chinneck’s giant ice cube Christmas tree at Kings Cross