Thank you very much for your answer,
I did the following test, i alredy tried before completley removing .htaccess ( ie. renaming it), at first i thought there is no error but after a few reloads the errors accours agian ( even more strangley, sometimes the page is served partially always til the same point somewhere in the middle of the footer but all that follows is not there ie scripts and closings, refresh seems to solve it or bring an error ).
I've uploaded a fresh copy oe the wire/ directory and index.php ( overwritten old files, I'll try now first deleting the exsiting and then uploading ). Did also 'REPAIR tables' trought phpMyAdmin - status was ok by all tables but the error still occours.
Tried now your suggest with a plain php file containg only
<? phpinfo(); ?>
no luck there, error occours even when accessing the file directly, which leads me to the idea that it must be a server error. But other websites that i have on the same host ( diffrent directories and domains but same host ) seem to work just fine, also the fact that the problem occured just out of the blue is also strange.