When i press the camera key, it won't turn on the camera(which it should) is there something wrong?? Samsung Jet S8003

Why don't you try updating your phone camera firmware..

here's how..
>> press the keypad menu
>> type the code *#6984125*# , it will lead you to phone internal settings, which has the following options, admin, network, internals, etc...
>> scroll down and select internals, it will prompt you for password..type the code in the message box *#9072641*# and press confirm,
>> once on phone internals,select test mode
>> from test mode menu; select video which is item 6, or type 6 and press ok to lead you to videos menu,
>> you will see a lists, which includes your update camera firmware. (item no 3)
>> type 3 and press ok and wait till it has completed its updates and says successful.
>> press end key to return to your phone menus,
>> you would want to restart your phone for the updates to be fully completed.
>> once restarted, select camera, or press camera button and check your camera...
please be noted that sometimes, other phones may restart after updating the camera firmware..

if this doesn't solve your problem, try to do a hard reset, back up your files first, contacts, task, notes, etc.... remove your battery, sim and memory card..
reinsert your battery and type the code... *#2767*3855#, please be reminded that all user settings will be lost, and communities profiles, including those of friendsters, facebooks links and internet profiles.. you need to configure and update this after successful hardreset through internet..

if still doesn't solve your problem and you have a warranty, i suggest to bring it to your nearest service center before doing all of the steps above..

regards..