This is a weird problem that popped up yesterday. I had done the upgrade from 2.3 to 2.5 quite sometime back and this problem happened only yesterday.
I cannot see the blog /wp-admin/index.php page. But it loads the other administration area properly. (Like comment moderation, plugin, theme, Write post/page area). It loads the public facing pages fine.
Here is a screen shot of the wp-admin/index.php page:
That is all that loads.
Here is a screen shot of the one of the other area, which loads up fine:
I downloaded the latest WordPress 2.5 from WordPress.org and did a ftp over the blog and the problem still persists.
Is there something I am missing? Do I need to provide any more information?