Technics SU-G70 clicks but doesn't display or sound

I turn on the amp (Technics SU-G70) and it clicks as though the power is turned on (and later you're able to return to feel that the amp is warm). However, the display is blank and there is no sound output. In the past, I could just slap the side and it would come on. After hitting it, the amp would either go back to blank after a few moments or it would stay on. It was hit-or-miss, no pun intended. Now, it seems no amount or strength of hitting will get it to come on. Please help. I have my first HDTV coming in a couple of days and I want to have at least something to hook-up. :-) Thanks.