I still don't understand , did you try and link the two PC's sound cards
Please specify in detail as I still don't understand how you got that right, the only solution is to install a PCI sound card now. What were you trying to do.
OK I connected two PC sound out puts (1/8" stereo males to two female inputs and one output to connect them to one single sound system . This , somehow shorted something out on my e machines motherboard, Replaced the sound and lan w pci cards and they now work, pc will not start up with out jogging the power cord on and off the tower. Thought power supply might be shorted, replaced same but no joy. PC works ok after it starts up, but it is neccessary to play with power input ot get it started . OK ? thanks for your patience. Bob