Did you chmod the entire /data directory or just /data/_pages?
You can also turn debug mode on to get the error message instead of a blank screen.
Similar to this thread, you should start with a fresh install on your new server. The installation process checks for server compatability. By copying all files, you've bypassed this check and there may be something we could find out with the install information.
Once you do a fresh install, if safe_mode is on, you won't be able to just copy the /data folder over unfortunately. It will probably work to copy everything in the /data directory except for /data/_site/config.php, but it has not been tested.