SOURCE: backlight has gone in controller
check your device manager and see if windows recognize it. If didn't it will splat it.
SOURCE: logitech z5500 speakers no power
certainly sounds like a fuse problem. First check that the fuses you have used work in another appliance. You should not have to use a fuse from the logitech company but it will be rated for your speakers so would probably be best. If the fuse checks out (both plug and amp) then check the wall socket and the power cable.
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