...the motherboard anyway. Take a look at it's connections to the board. Maybe a bit of solder, or heat the old solder would fix it.
After doing seemingly everything possible to identify and fix the crackle, hiss, hum, static sound coming from my line-out port to my speakers, I think I've come to the sad conclusion that the problem is the actual line-out port itself on the back of the computer. The headphone port on the front gives clean audio so the fault must be from that back port. Really, really, really'd rather not have to send this out for repair!!! So...can that be fixed by mortal man or is the brand new box gonna have to go the shop? A Dell rep said the whole motherboard needs to be replaced. Really?!?!