I am trying to install SS to LAMP server all the requirements checks OK .htaccess w/r requirements are OK as well. When I hit the install button I get the following.

Installing SilverStripe...

I am now running through the installation steps (this should take about 30 seconds)

If you receive a fatal error, refresh this page to continue the installation
# Creating 'mysite/_config.php'...
# Creating /usr/hosts/domains/herekezeki/www.herekezeki.com/httpdocs/mysite/_config.php
# Creating '.htaccess' file...
# Creating /usr/hosts/domains/herekezeki/www.herekezeki.com/httpdocs/.htaccess
# Building database schema...

and it stalls.

When I reload the page or any other page I get 500 Internal Server Error.

My .htaccess file after the trial is:

## SILVERSTRIPE START ###
<IfModule mod_dir.c>
DirectorySlash Off
</IfModule>

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_URI} !(\.gif)|(\.jpg)|(\.png)|(\.css)|(\.js)|(\.php)$

RewriteCond %{REQUEST_URI} ^(.*)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .* sapphire/main.php?url=%1&%{QUERY_STRING} [L]
### SILVERSTRIPE END ###

when I remove the .htaccess it goes to install page again with "User 'herekezeki' needs to be able to write to this file:
/usr/hosts/domains/herekezeki/www.herekezeki.com/httpdocs/.htaccess" warning, naturally.

What is wrong. I couldn't figured it out. Any help is greatly appriciated.

I am on a rented web hosting space and have no way to check the logs. Support says its a .htaccess problem.