Empty page with logo after PrestaShop installation - installation

My website is hosted on OVH (France), with one SQL database.
I have installed manually PrestaShop from the GitHub folder.
After multiple attempts in installing PrestaShop, I finally reached to have it installed but since I choose to use the demo products (in the installation process and as I am new to PrestaShop), I think obtaining a white page with only the logo is surprising to me (see attachment).
I tried to print the errors switching to True the dev parameters from the file defines.inc.php, but nothing was printed.
Also, I see nothing in the console of the browser.
I suspect there is a conflict with the SQL database, but I don't know what to check.
Would you have any tracks to check what's wrong with my installation ?
Regards,
A&A

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http://www.looogo-web.com/web-design-company-blog/proceed-to-checkout-button-goes-back-to-home-page-empty-cart-magento-cart-issue/
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