500 Internal Server Error when saving articles - Joomla! Forum - community, help and support

i have joomla 2.5 , php 5.3

every time try save article or disable plugin/module give 500 internal server error i've tried disabling components , plugins checked .htaccess make sure rewrite rules correct.

any ideas?

please run forum post assistant provide information try , resolve issue.
please follow instructions in post , program pack closely