Canon PowerShot S1 IS LCD and viewfinder black?

Hi
I have a Canon PowerShot S1 IS, the LCD and view finder are completely black now, I can see old photos on the memory card, but no new pictures or anything can be seen through both. the Lenses and shutter are still working well.
Is it the CCD? how much does it cost to repair it? is it easy so I can do it myself?
Thanks