[eluser]BrianDHall[/eluser]
First go into your config and change the log_threshold setting to 4 and see if it is giving you any errors. If that doesn't work...
Try transferring in your config folder into your working fresh install - you'll probably get errors about missing classes, else something is wrong with your config folder.
Then transfer controllers, see if that works. Then models, then views...eventually you'll find a point where it suddenly goes blank and at least you'll have something more to go off of.