How to fix camara? please help if i don't fix it i'll be in alot of trouble.?

i have the cyber shot dsc-w30 and when ever i turn it on it tells me to turn off the power and try again and the lens comes in and out 3 times. when it comes in and out it works peferfect it extends all the way out and comes back in so what is the problem can so one please hel if i don't solcve it a'm in so much trouble.