Hello, I recently received a Raspberry Pi as a Christmas present. I have never used one before, nor have I used Linux. So far, I am getting nowhere. My keyboard and mouse were not working. I was given the advice to purchase a powered USB hub. My keyboard works but my mouse does not. I have tried three different mice. They are all getting power and all work on my laptop, but none seem to work on my pi. Can anybody walk me through and help me diagnose the problem.