Did you try the standard things that usually fix problems in OSX already? Just curious. Here's what I do when I begin having issues.
1. Repair permissions
2. Update prebindings
3. Run disk repair off my OSX dvd on my OSX volume
4. Reset NVRAM, etc.
Not in any particular order, and not all might be relevant if at all, but I'd suggest trying those before panicking about anything. You can MSN or PM me if you want any help with those.