XF 1.4 Need urgent help

My site was deleted (trying to fix a faulty plugin, long story). Luckily I have a full backup of both the files and database made today. I re-uploaded the files, but I just get a blank screen. What do I need to do? The database wasn't deleted, and config.php still points to it.

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Fixed! Praise Jebus. For anyone with a similar problem who happens to find this on Google:

The issue was caused by having a copy of the files that were one day old, with a current database. What happened was I'd installed a new plugin today, and I figured just re-uploading the plugin files on top of the one day old backup would do the trick. It didn't. You can see what's giving you the white screen by adding ini_set('display_errors', true); to your config.php file.