I have the logitech z560, sub works but none of the satellite speakers work

Gently open the front grille and remove the driver. You should see if the wiring to the driver is loose.

What's changed? Has the computer been moved? Cat or dog been around the connections? Kids?

What surround mode is it in?

the back of the sub has 2 rca connections for left and right speakers so all you have to do is either find satellites that use rca connections or find or make your own "clip-on" or detachable wire to rca connection.

1) plug the cable coming out of the satellite with the sub-woofer at the reat 2) plug the 3.5 cable jack coming out of the second satellite to the computer audio out ( generally green color connector ) connect the power adapter with the sub woofer
and you ready to enjoy the music. make sure yo switch on the the power adapter.

Check that you have not "panned" the sound-output to a setting of "0% left-rear, 100% right-rear".

Try plugging in some headphones to the right satellite, unplugging them and turning the speakers off and on. This worked for me, and is probably the switch getting stuck between headphones & normal speakers.

Here is a link to a manual. Hope it helps.
http://logitech-en-amr.custhelp.com/cgi-bin/logitech_en_amr.cfg/php/enduser/std_adp.php?p_faqid=3514&p_sid=6Gvce3lj&p_lva=8040&p_accessibility=0&p_redirect=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9ODYsODYmcF9wcm9kcz04NDQsMTcmcF9jYXRzPSZwX3B2PTIuMTcmcF9jdj0mcF9wYWdlPTM%2A&p_li=

I would check the LogicTech website for a repair facility. You may want to dig a little deeper as I'm sure LogicTech does not make their own sub woofer but OEMs them from JBL, or such...

try fixing its amps by simple reheating it. if still doesnt work try replacing its parts... it is certain that it has a prob on the amps.

I repaired Z-560 speakers with a defective left front channel by chopping off one of the input leads close to the 3.5 mm stereo jack that goes into the PC and joining on the leads from a new one. At first I thought the fault lay in the main amplifiers in the sub woofer unit but I was wrong and it turned out to be far simpler to fix than I anticipated.

Rod in Ottawa