No, there is no warranty, because I bought it on Ebay. The person who worked on it is a professional, who is also a friend, and he lives in another state. He did the job for free. I didn't know about the sound problem until my husband picked it up and brought it home. Everything else works great.
You didn't answer my question. What in the motherboard can cause a problem like this? Is it something I can fix or a setting I can change?
Thank you.