Power won't stay on

From what I see at Sony, there are 2 models of the Cybershot S650

DSCS650 or VGNFS650F
Please confirm which type it is.

Sony has a great website.

If you would like to link to this page you can choose which model it is

http://esupport.sony.com/US/perl/model-find.pl?mdl=Cybershot+S650

Once you choose the model, click on it and go to the next page
on the right you can live chat with a Sony Rep, this might be your best bet on this problem. It sound mechanical to me or it is set to turn off at a particular point. This camera is designed to turn it self off about 3-4 minutes if not in use. This is the Auto-Power off function. Page 11 of the Manual. Link below
http://esupport.sony.com/US/perl/model-documents.pl?mdl=DSCS650

once you go to this link click the 5th one down under Manuals

I can imagine you can reset this in the Setup (looks like a little tool box) not sure though.

Use the links above, if all else fails contact Sony through the live chat.

Sorry I could not help you more.

camera needs to be reset...but not gonna be easy

take batteries out...hold down power switch for 15 seconds...then put batteries in and restart

if camera works...go straight to menu and reintialize all functions

this is a firmware/software problem that is not easily fixed...and Sony wants $91 to fix a $100 camera

keep repeating this until it works...may take numerous attempts...but this is how I got my camera running again