Module disabled checkout page - White Screen of Death

[drwho]

Recently a installed an international package forwarding module that is partners with Zen-Cart. It failed to install properly, and crashed my site. Per the instructions we replaced the functions_lookups.php with our backed up one and delete config.bongo.php. It did bring up our site, but failed now our checkout page is blank.

We also removed all the files pertaining to that module. However the checkout page is still blank

What can I do to get the checkout page back up?

zencart 1.5.0
PHP 5.2.17
SQL 5.0.96
Bongo Checkout module
http://onlineginsengstore.com/catalog/

[Ajeh]

If you check your debug logs, either in /cache or /logs depending on your Zen Cart version, what are you seeing?
http://www.zen-cart.com/content.php?124-blank-page