Problems moving site to another domain

I tried that and the blank screen started as soon as i included the first line from original script

This is why I suggested replacing the main index.php file with a new copy from source download.

A blank screen is a common outcome when there is a byte-order mark (BOM) at the start of a .php file.
A fresh, clean file is often the easiest way to fix a bad file.
Make sure you are using UTF8 encoding for your script files.