Can't login to admin Suddenly admin become a white page

Can't login to admin Suddenly admin become a white page. I looked at the index and login files in admin folder they look Okay as far as I know. The only event that happened before that was that my hosting company migrated to a new server and new DNS however they checked the php for me and they said it is functional the problem is in the file. Can anyone help me My cart still take orders but I cannot go to admin Thanks

Hi:
It was my hosting company problem, they fixed it and they would'nt tell me what it was so I can post it here to help others. Originally they said it is the login.php file being incorrect and when I quized them on more details and I told them I loaded a fresh login.php file, they suddenly fixed it.

Perhaps an error on the secure was causing this issue?