Problem with the Elgg Installation

Hi everyone, Im new to Elgg i find it very useful, I hope you can help me with my problem,

Im using elgg in one of my website and working properly. I installed again another elgg in the same web server. but a blank page is appearing, the table is uploaded, but only one white page appear after the installation process. The mod_rewrite is working because i already contacted the web server support?? What do you think is the problem? I tried 5 times installing with different versions of elgg but all the same problem only a white page is output.

Hope you can help me,

elgg_user