Error 500 Internal Server Error

[qwertz]

I'm running WordPress 1.5 Beta and phpBB2 on Abyss Web Server X1
So far, PHP 4 and mySQL are working fine, but there seems to be a problem with the redirecting or the server timing out. Let me explain:

My server is run on a: Pentium 4 1.51 Ghz, 384 RAM (Odd number yes, =P), with 2 seperate hard drives adding up to 120 Gb. The server runs on a partition that has 6 Gigs worth of space left.

On with the problem; everytime I try to post a comment on WordPress (an automated blog engine), it takes about 7~8 seconds to load, then it displays an error screen saying: Error 500 Internal Server Error. Not only does this happen with Wordpress, but also during registration for phpBB2. When users try to register on my board, after they submit their registration information, they are greeted with the same Error 500 page.

I would like to say that admining my forum and blog from remote locations works perfectly fine.

I'm sorry about being a little vague on my problem, but I really don't know what's to blame here.

Any help would be GREATLY appreciated! Thank you very much =D

[admin]

qwertz,

Can you send your php.ini and abyss.conf files to support@aprelium.com (don't forget to write 2 or 3 lines to help us remember what is the problem.)