First, make sure you have new batteries in your camera. If this does not work, I have a few more suggestions for you.
Taken from the [[Kodak EasyShare C713|Kodak EasyShare Troubleshooting Guide:]] If your lens is not fully extending the motor may be broken or malfunctioning. If this is the case, the lens assembly will need to be replaced: [guide|2437|Lens Repair Guide]. The issue could also be your logic board, which means that you will need to send your unit back to Kodak for repairs. This can be pricey and you may want to consider replacing your camera.
Lastly, make sure you check out [http://www.kodak.com/global/en/service/products/ekn034494.jhtml?pq-path=11887|Kodak Support] for this camera. Also, follow Kodak's [http://www.kodak.com/global/en/service/repair/troubleshooting/troubleshooting.jhtml?pq-path=6198|Step-by-Step Solutions and Repair] Guide.