I have an X20 that I bought from a friend about one and a half years ago (don't know when he bought it, but it's probably at least four years old). A couple of weeks ago it suddenly stopped working (nothing happened when I tried to turn it on). I have tried both the regular "on-switch" and the preview button, as well as different batteries and checked the battery voltages to make sure the charger works. The camera does not react at all. Any ideas about what the problem could be? Is there anything else I could try? Grateful for any suggestions!