IPod and iPhone both have black screens after update?

I updated my iPhone 4 and iPod touch this morning. I can now only access the lock screens. When I unlock them, their screens both go completely black. I've tried holding the power and home buttons at the same time, the apple logo will appear but it still just goes to a black screen after unlocking. I tried restoring them both, but iTunes just gave me error messages saying that they can't be restored. Is there anything I can do to fix them?

Go to apple.com/support there are experienced apple workers there who can really help you.