A bit more detail would be needed to answer your question. Usually, a blank page has something to do with your server’s configuration. To narrow down that issue, please take a look at your server’s log and see if there are any error messages. If you post the error messages here, people will be able to help you better.
A look in the FAQ might help to get further information on how to solve your problem: When I click some button or follow some link, I'm left with a blank page. What do I do?