Too bad. It may be either the camera or battery problem. But if you tried the AAA batteries and with the same result, it's most probably the camera problem.
The length of warranty usually depends on the country of purchase. But I believe worldwide is one year? The best thing you can probably do is to contact Ricoh with question if your camera is still covered by warranty or not. Just follow the support contacts according your region:http://www.ricoh.com/r_dc/support/