Pentax Optio

Hi. I have a problem. I have pentax optio which was working fine but one day when I turned it on, it powered up but the screen shows grey. I tried to turned it off and on many times and it turns on and off fine but still the screen is all grey nothing else but grey color on the screen. The flash works and it blinks like it takes picture but still the grey screen. If someone knows what the problem is let meknow. Thank you so much in advance.