4
Check your cache, template_c and uploads folders, make sure they are chmod 777. Were you able to do a one piece querry to install the database? Try this in phpmyadmin select your database, at the bottom click on select all to put check marks by all tables, from the drop down menu at the bottom choose repair.
One other thing, is there any difference you can think of in this installation that may be different from the old? In other words something that may be in the database, that you may have forgotten to include in the installation.