just realised error log examples may be useful:
[Sun Nov 1 16:14:42 2009] [error] [client 131.111.207.78] Premature end of script headers: /home/*/public_html/wp-admin/install.php
[Sun Nov 1 16:13:15 2009] [error] [client 131.111.207.78] Premature end of script headers: /home/*/public_html/wp-admin/index.php
[Sun Nov 1 16:13:10 2009] [error] [client 131.111.207.78] Premature end of script headers: /home/*/public_html/index.php
