I would Smack it couple of times.....That seems to be the fix for Sony Cameras these days. Don't laugh its true. Do a google search for "Smack Sony" and see that reading is believing. I have a DSC-f707 that the Smack worked on, and I also did it on the same camera you have, the CCD-Trv318, but the 318 had a different problem than yours did. I was getting the Dreaded c:21:23 error...The Smack down fixed it!
Darren, August 2007