A friend had a similar problem with the SC 35, he unplugged everythiing and decided to test it one more time before taking it to the shop. The next day it worked! I don't have an explanation since he swithed amps, cable and swapped speaker inputs the day before.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus Five 200 amp, Chase SS 18.2(2), VS 18.1(2), Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500