Error: no connection with database

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After installing Seo Panel (www.seopanel.in - open source software to control search engine optimization processes of your websites) on my working website, my website stopped working. The browser says: "cannot connect to database. A database error occurred while processing this request." (translated by me from Dutch to English).
Stupid of me, I did not make a backup first. Now I am lost: how to correct this problem, without completely building the website again? When I check my database with phpMyAdmin everything seems to be O.K., but nevertheless the site is not working anaymore.
I anyone could help me, I would be very gratefull.

 
Bojoko replied on at Permalink Reply
Update:
I deleted the database and installed files of SeoPanel in public_html\seopanel. Still not working. Then I thought: perhaps I must reset my password for the database I originally made for Concrete5. That worked!
Apparantly the installation of SeoPanel had messed up my database login password. At least a big lesson learned: NEVER make huge changes without backing-up website files and database.

Problem solved.