I can't login into my new install of wordpress

Hi,
Today i installed my new wordpress installation then i imported the old db and my personal template, which i had got, and all seemed to work…but when i try to login from the ./wp-login.php i get a blank page and it wont work, and if i try to log from the ./wp-admin i get those symbols “???” (whitout “”).
I forgot, i use MAMP PRO for mac as a localhost.
Can anyone help me?

PS: Sorry for my bad english, i’m italian.