(RESOLVED - Thank You!!) Bizarre WordPress Admin problem - help!!

Hi

I have run into a bizarre issue after moving a couple of WordPress sites between HostGator hosts, I'm hoping that one of my fellow Warriors can shed some light.

I moved a number of sites between two hosting plans, the sites retained their domain names and the changes to the nameserver values were made accordingly. The majority of them work perfectly, but two of them have a very odd problem.

The two sites in question display just fine, however trying to login to the admin dashboard is impossible (at http://sitename.com/wp-admin), as the screen is completely blank. Using the wp-login method displays the login box, but when I login as admin I get teh same blank screen instead of the dashboard.

They did not display this behavior on the original host, I reset the nameservers to the old values to confirm this.

I moved them using the following method (which worked for the 16 other sites):

1 - Downloaded all the files
2 - Made a backup of the MySQL database
3 - Created a new account on the target server
4 - Created a new MySQL database on the target server
5 - Imported the data into the new database
6 - Edited wp-config.php to reflect the new database values
7 - Uploaded the files to the new host, with the edited wp-config file included.
8 - Pointed the nameservers at the new account.

I have Googled this issue for hours, found a few posts suggesting removing spaces within the functions.php file but it didn't help. Others suggested a missing host name value in the wp_options table in the database, but that is not the case here. I've repeated the transfer on the affected sites, but that didn't help either.

The only thing I can see about these two sites that differentiate them from the other ones is that for some reason (I didn't build them so I'm not sure why) these two sites have their URL's set to "http://www.domainname.com" as opposed to "http://domainname.com", and as a result I had to access them using the "www" prefix. On one of them I edited the database dump to change all instances of "http://www.domainname.com" to "http://domainname.com", that succeeded in allowing me to access the sites without the "www" prefix but it did not solve the blank admin screen problem.

Short of installing WordPress from scratch and rebuilding them from the ground up I am a loss as to what to try next.

If anyone could shed any light on this issue I would be most grateful - don't have much of this grey hair left and I'm pulling a lot of it out over this one!



Thanks

Bill