Dear esmi. Thank you for the comment but bell I AM the host, I am the SysAdmin and I and the webmaster and the blogger (this is for my technical blog). Yes I understand this is not the real solution but...
Have you read my post saying that WP, MYSQL, APACHE, PHP was reverted to several prior state where it was working before but all failed. Nothing seams to do it. This is the only fix I found on this forum (other thread mentionned) that actually worked.
In fact nothing much changed on that server (or I can't find it), I spent days looking at several possibilities without success.
If this method work for anyone in the same situation Well let be IT until we figure out the real reason. At least I was able to enter my Dashboard (WP Admin pannel).
So if any one has any idea I am willing to try it!
[No bumping. If it's that urgent, consider hiring someone.]