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Sometimes cleaning the disk will solve the problem. Also resetting the system by pulling the power cord and putting it back in can solve the problem. If this does not help, then sometimes updating the system with the latest software can help. Just call Bose and ask for an update disk. Last but not least if nothing works, send the unit to Bose for repair.
Your lovely Bose has problem with its mechanism that cause load / unload totally out of order. If you hear some noise while you turn on the bose or when you hit some buttons, it is telling us the motor still work. Now we need to check the broken gears ( or other mechanism linkage). If you able assemble this Bose, go ahead to find and fix it mehanism ( you may need some parts replacement.
Note : Be carefully with its laser lens while power on ( avoid direct contact to your eyes).
The sub is bad.the power supply inside the sub is your problem.If your unit comes on it could also be a defective dsp pcb in the sub.everything in the sub runs the head unit.If you send to bose they have a 175. flat rate.
I hd this same problem a couple of months ago. Disconttect all peripherals (any exterior amps, roommates) plug the power connector and wait for two minutes, while waiting connect the main system. try turning the LS 48 on. If this clears thing turn off the LS 48 and connect the peripheral one at a time testing with each new connection. Happy hunting.
you need to bring the head unit and the bassbox back to bose for service or repair, it is aproblem with the powering up of the amp module, and could be caused by the control circuit in the haed unit or a problem in the amp, which has a slow ramp function to prevent louds bangs and pos at start up. in that case i would guess the latter is faulty, i would guess it is also a warranty repair for bose too.