apache 2.2 - Always get a 403 Forbidden error

I'm getting a 403 Forbidden error on my client's server (which somebody else set up). I'm using Apache on CentOS. Since somebody else set up the server, and since the server is CentOS and not the Ubuntu I'm used to, I don't know how to fix the problem.

Any advice on how to troubleshoot this problem?

Edit: in the logs, I keep getting this series of notices/warnings:

[Mon Feb 06 09:45:43 2012] [notice] caught SIGTERM, shutting down
[Mon Feb 06 09:45:44 2012] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Mon Feb 06 09:45:44 2012] [warn] RSA server certificate CommonName (CN) `Parallels Panel' does NOT match server name!?
[Mon Feb 06 09:45:44 2012] [warn] RSA server certificate CommonName (CN) `Parallels Panel' does NOT match server name!?
[Mon Feb 06 09:45:44 2012] [warn] Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Mon Feb 06 09:45:44 2012] [notice] Digest: generating secret for digest authentication ...

[Mon Feb 06 09:45:44 2012] [notice] Digest: done
[Mon Feb 06 09:45:44 2012] [notice] mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
[Mon Feb 06 09:45:44 2012] [notice] mod_bw : Version 0.8 - Initialized [0 Confs]
[Mon Feb 06 09:45:44 2012] [notice] mod_python: Creating 4 session mutexes based on 50 max processes and 0 max threads.
[Mon Feb 06 09:45:44 2012] [warn] RSA server certificate CommonName (CN) `Parallels Panel' does NOT match server name!?
[Mon Feb 06 09:45:44 2012] [warn] RSA server certificate CommonName (CN) `Parallels Panel' does NOT match server name!?
[Mon Feb 06 09:45:44 2012] [warn] Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Mon Feb 06 09:45:44 2012] [notice] Apache/2.2.19 (Unix) DAV/2 mod_fcgid/2.3.6 mod_python/3.2.8 Python/2.4.3 mod_ssl/2.2.19 OpenSSL/0.9.8f mod_perl/2.0.4 Perl/v5.8.8 configured -- resuming normal operations

Edit 2: here's my VirtualHost stuff:

    ServerAdmin jason@electricsasquatch.com
    DocumentRoot /var/www/html