This is great,thanks dctrmac !
My Klipsch Promedia 2.1 is alive again !
I used an Belkin keyboard extension cable ,no problem until now ( about 12 h) .
Somebody asked if this can be done using an mouse wire ....IT CAN'T ! The mouse has no grounding wire ! And the colours don't match .
Thanks again for this great solution ,excuse my bad english and good luck to you all !