Control Panel White

[alessandro]

Updating Debian from debian lenny to squeeze. Everything went good end even the sites running smoothly. I only have one problem, the control panel admin access "is white! Nono I can find solution you give me some help please, thanks

error log this

[Thu Apr 14 09:37:56 2011] [error] [client 213.46.135.79] request failed: error reading the headers
[Thu Apr 14 09:40:37 2011] [error] [client 180.191.150.142] request failed: error reading the headers
[Thu Apr 14 09:43:44 2011] [error] [client 87.212.145.172] request failed: error reading the headers

[Thu Apr 14 10:15:32 2011] [notice] suEXEC mechanism enabled (wrapper: /usr/lib/apache2/suexec)
[Thu Apr 14 10:15:32 2011] [notice] Apache/2.2.16 (Debian) mod_fcgid/2.3.6 mod_ssl/2.2.16 OpenSSL/0.9.8o configured -- resuming normal operations