Just about to order a new Sony Cybershot, when just for a laugh I typed in "sony camera access problem" (as my current DSC-W30 had stopped working and kept coming up with access error, zooming in and out erratically, asking me to power off and on etc etc). Thought I'd have to bin it.
Took me to this forum so I banged various parts of the camera across my knee and a table.
After 3 or 4 tries, hey presto back to normal.
Brilliant! - wish I'd tried this with other Sony kit I've had that's gone bonkers for no reason.