If camera seems to be fine but just won't turn on, just a beep or two or even just half-a-shot, the battery may have ran out.
Recharge the battery overnight using the wall charger or replace with a fresh new set of alkalines or lithiums whichever the case may be. Ordinary batteries won't do.
If the lens is stuck, do not push it in. It will correct itself when power is restored.
Now you know!