I'd also take a look at the Apache error_log to see if there's any indication evident there. Keep in mind that if the PHP code suppresses error reporting (by prefixing expressions with the @ character) then nothing will be reported.

>---- Original Message ----
>From: Eric Covener <covener@(protected)>
>To: users@(protected)
>Sent: Fri, Sep 3, 2010, 9:35 AM
>Subject: Re: [users@(protected)
>
>On Fri, Sep 3, 2010 at 9:31 AM, chris h <chris404@(protected):
>> Does a failed PHP script not show a PHP error as well as send a 500 response
>> code?
>>
>
><fajita> White Screen Of Death, one of PHP's specialties. It is
>produced when an error has occurred in a PHP script and the error
>               reporting goes either to the error log or to
>nowhere. To solve it, look for the error reporting settings in php.ini
>(or use
>               ini_set()). Also check the error log (see step
>one). Further questions MUST GO TO ##PHP.
>
>
>--
>Eric Covener
>covener@(protected)
>
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