Elgg website moved to Arvixe hosting and now Internal Server Error

I moved recently to Arvixe web hosting following these steps:

http://docs.elgg.org/wiki/Backup_and_Restore

I obtained a white page.

Switching on error logs I found : 500 Internal Server Error

I've read this page : http://docs.elgg.org/wiki/White_page

What I've tried to do till now:

disabling all plugins (creating disabled file inside mod folder)

check htaccess file

check db credential

clear cache

set all file permission under public_html to 644 and all folder permission to 755 using these commands:

find . -type f -print0 | xargs -I {} -0 chmod 0644 {}

find . -type d -print0 | xargs -I {} -0 chmod 0755 {}

 

check for corrupted files using "php filename.php"

 

any suggestions or ideas ?

 

Thank you,

Simone