Here are some ideas:

• Something printed to STDERR
• The "Content-Type" header is invalid or missing.
• You are using SuExec and it's causing problems.

For further ideas, you can:

• read the FAQ included in the perl documentation: perldoc -q 500 or perldoc perlfaq8
• Try meryln's tips
• Check the related Apache documentation
• check that the line break style is correct
• Make sure the shebang line is correct.
• Try CGI::Carp qw(fatalsToBrowser); or CGI::Debug

Mark

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