Where to check for 500 Internal server error ?

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http://linuxexchange.org – I am a newbie to linux. And I am working in a hosting company as a fresher. I am getting many tickets of 500 Internal Server Error. As a server admin, how do I check it for correct the issue ? Or where to check this since I am in a shared server I cannot make any changes to the major apache configuration files. Please let me know some guide lines to check 500 Internal Server error and some common fixes for this. (HowTos)