@Forrest Yu: According to Dell's docs on their home page, Optiplex 380 has a "Line in" at the back, not a "Mic". (http://www.dell.com/content/products/productdetails.aspx/optiplex-380?c=us&l=en&s=bsd&cs=04 , click on "technical guidebook)
Is that not consistent with your view, i e at the back the input is actually a mic?
@Forrest Yu: According to Dell's docs on their home page, Optiplex 380 has a "Line in" at the back, not a "Mic". (http:// www.dell. com/content/ products/ productdetails. aspx/optiplex- 380?c=us& l=en&s= bsd&cs= 04 , click on "technical guidebook)
Is that not consistent with your view, i e at the back the input is actually a mic?