Well ... I too experienced the same problem with my JVC AV-36980 ... One day it worked and next day it didn't. No power at all ... a complete mystery!
I e-mailed JVC with my problem, and after waiting for more than a week for a reply (that still hasn't come), I decided to call their toll-free telephone number for some assistance. The technician claimed that this was not a "known problem" and advised me to simply unplug the set from the outlet, leave it unplugged for an hour, and then plug it in again and try it ... if that failed I was told to contact my local authorized JVC repair center. Naturally it didn't work!
Finally, after visiting this web site and seeing my many comrades who had the same "No Power" problem, I tried the now-famous "Tom P" fix. I located the C926 capacitor (the top was indeed slightly bulged) ... and replaced it with a 1000uF 35V capacitor that I bought at Radio Shack for $1.69 ... and guess what? ... IT WORKED! ... Soooo thanks from me too Tom ... and by the way ... Thanks for Nothing JVC!