Cant view wp admin pages

They will not load for some reason. Last night I turned on a new theme I bought and then ftped, using fireFTP, four required plug ins and then it started acting up and now it simply will not load the pages in the admin.

I tried downloading a brand new copy of wp and then ftping the new copy of wp-Admin but no change. I also removed the four plugins and that did not help either.

Lastly I changed to an old theme and that still did not help.

Any thoughts?