when i first used my onkyo ht-s 6100 the subwoofer worked fine when i first plugged it in. a few hours later, after it went into standby mode, it will not come off standby (redlight to blue light). Ive tried refering to the manual, and it tells me to change the subwoofer sensitivity, but it doesn't explain how. I've tried watching tv, a blu-ray, and even playing a game. nothing turns it on.