It's easy to fix this problem. Stop using the audio chipset on the motherboard, and install a Sound Card. They are economical, and will surpass the audio quality of that eMachines motherboard, by a mile.The eMachines T2042 Desktop PC, uses one of these TriGem Imperial motherboards,
http://www.e4allupgraders.info/dir1/motherboards/socket478/imperial.shtmlScrolling down you can see the audio is AC'97.Not worth writing home to Mom about.The Sound Card you obtain will go into one of those long white PCI slots.(There are 3)Any available PCI slot that is open, with no adapter card in it.Here is but one example of a sound card that will work,
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=420797&CatId=2771Need guidance in installing? Post in a Comment.[ Remember to follow Anti-Static Precautions.Anti-Static Precautions:Your body carries Static electricity. Static WILL fry out, (Short Circuit), the delicate hardware components inside a computer.Relieve your body of Static BEFORE working on your computer.Computer on a table, computer Unplugged from power, computer case open.TOUCH an unpainted surface of the metal frame, of the open computer case.This action will relieve your body of Static.Should you leave your computer in the middle of working on it, beSURE to Touch the metal frame again upon your return ]