I have a Sansa c250 MP3 player and it is giving a lot of trouble! I've had it for over a year and it's worked fine up until the last few months. It will not load to the main menu. I only get the SanDisk screen. I have tried turning it on and off and waiting for it to reload. I even tried plugging it into the computer but it will not load past the begginning loading screen! What should I do?