Reset IE is on the web so I'll shortchange you on that.

As to the sound issue, there are volume controls, muted or not to try first. Also, if the speaker cable isn't plugged in the right jack it will not work. Many Dells have 5 or 6 such jacks.

If you give up, look up those 10 dollar and under USB sound cards on Amazon. Try the #1 seller first. It's under 10 and stands in when the internal sound system dies.
Bob