My coolpix s50 won't turn on. to my knowledge it hasn't come into contact with any water or liquids and the battery is fully charged. is this something i can fix myself or do i need to send it to nikon?

A couple of possibilities. The battery is bad and not accepting a charge. Replace the battery. The battery terminals are dirty. Using cotton swab and some isopropyl alcohol, clean then fully dry the metal contacts on the battery and inside the battery compartment. Before turning it back on, be sure everything is fully dry.

I noticed that you noted that you have a new battery. Have you fully charged it? Although batteries are charged before they leave the factory, you do not know how long they have been sitting on the dealer's shelf slowly discharging. The charging time for your EN-EL10 battery is about 100 minutes. Once your battery is fully charged, try to turn the camera on again. If it still doesn't work, you may have bought a defective battery, the battery contacts on the battery, the battery charger or in your camera's battery compartment may be dirty or the battery charger may be defective.
To clean terminals, rub a clean pencil eraser across the contacts. That will remove any dirt, grime or oils that may be preventing a solid electrical contact. Once the contacts are clean, charge the battery again and retry it in the camera.
If all that fails, contact the Nikon USA Service Center at 1-800-645-6687 9AM-8PM EST, Monday to Friday.

Replace the battery.

I have had mine for over 3 years and this just started happening. I bought a new battery and it seemed to fix the problem for about a week but is doing it again. It seems like it won't fully charge now like it formerly did!

Things to check first for a camera that won't turn on, or works intermittently are the battery contact points, ensuring that they're clean, and making good contact with the battery. Troubleshooting tips on other things that need to be checked may be seen here. These tips won't work for every case, but they're worth a try.

Hello Ice,

Please check the battery of the Nikon Coolpix 4100 Digital Camera. Please check the battery is fully charged or may be its damaged if its swollen. Also check the contact points of battery and camera and clean it. Insert the battery and charge it fully. When the battery gets charged fully then press the power button 4 to 5 times to start it. If the battery is damaged then replace the battery with new battery.

Things to check first for a camera that won't turn on are battery contact points, and micro switches that are located on the battery and memory card doors. Troubleshooting tips on other things that need to be checked may be seen here. These tips won't work for every case, but they're worth a try.

SD and SDHC cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.

Could be battery contact issue, or a blown power circuit. Try PhotoTech Repair Service, in NYC. They are factory authorized for most repairs, and are able to do warranty service in house. You can ship them your unit and, they are usually faster than the manufacturer, and cheaper! Plus if you join their facebook fan page they give you a 10% discount.
Here in the link to the facebook page, it has all the info you need.

http://www.facebook.com/pages/New-York-NY/Cell-Phone-Repair-NYC/312054784441

Hope it helps!

From the manual: "Turn camera off and then on again. If error persists, contact retailer or Nikon representative."