Upgrade Problems

Hey guys … I’m new to the whole wordpress scene – but I love it! I was trying to do the update, and it didn’t go smoothly. So, I backed up my whole blog (wordpress) folder into my root folder on my local disk thinking everything would be OK and I would just be able to copy it right back over onto my server. Well it didn’t work very well – I could just be missing something. If you go to the site http://rigelastronomy.com/blog , you just see a blank white screen. Is there anything I can do? Thanks!