I purchased the MX5000 some time ago. I have a Dell Dimension 9200. When I installed the keyboard and mouse the mouse worked for a few days and then gave out. I continued with the keyboard, just changing the batteries now and again. My Dell USB mouse gave out so I thought I would re-install the Logitech mouse. I now find both the keyboard and mouse don't work. The keyboard can't connect and the mouse's three lights say it's charged but within seconds of taking it off the cradle the light goes to red. Any ideas of what I can try? (before I bin it).