Just a quick bit of advice.
You probably won't get many responses because there is not enough information to go on. We're not mind readers so the more information you can provide, the better our understanding of you issue will be.
Some things you may want to do:
- Check your log files and see what errors are present
- turn on Joomla Debug mode and VM debug
- check it in Firefox/Chrome and use Firebug/Inspector to fault find
So with no real info, not many people can help you.
I hope this helps.