Logitech X-540 repair Help

[boulepick]

i have an APC C5 10 Outlet Power Filter for protection against power surges, pikes and lightning. it has 2 High Current Filter outlets. i plugged the logitech in one of them and since them no sound is coming out of the logitech. it will turn on but no sound will come out of any of the speakers. what must i check or replace to get it back working again. don't know what more information you require.