I have installed new site in Joomla 1.7 and its working fine, but when i checked its back-end (administrator) got 500 Internal Server Error
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Note: Site
I had this problem, but none of your advices didn't help.
I fixed a problem only after I switched off all modules via PhpMyAdmin (PMA).
Table modules, changed parameter "published" to 0 for all and then enabled only few modules with these types:
After this I entered admin page and used top menu to enable all needed modules one by one. After admin page started to give me 500 error again I knew what module is faulty and I disabled it again via PMA.