Blank page upon adding product to cart

Every time I attempt to add a product to my cart, all I get is a blank page. This worked perfectly last night and now this morning it keeps failing. Anybody have an idea on where to look? Thanks.

http://2600strange.com/index.php?main_page=product_info&cPath=1&products_id=3

Brian

Get the Debug Tool from the Free Software Add Ons and see what errors show up in the logs that are created when you try to add to cart ...

All right, thanks for the tip, Ajeh. Here's what I came up with.

[13-Feb-2010 20:30:38] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/strang14/public_html/includes/languages/english.php:1401) in /home/strang14/public_html/includes/init_includes/init_templates.php on line 78
[13-Feb-2010 20:30:38] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/strang14/public_html/includes/languages/english.php:1401) in /home/strang14/public_html/includes/functions/functions_general.php on line 44

Any ideas?
Brian

english.php:1401)
1401 is the line number and there are only about 700 lines in that file
So this is indicative of some error in that file

Usually means there are extra lines or characters at the end of the file.

You guys are incredible. I deleted two extra lines at the end of the file (lines 1400 and 1401) and now it works perfect again. As always, thanks.
Brian

Quick question about debugging: do you guys typically use the Debug Error Logging Utility to debug php errors? What about html errors? Thanks again.
Brian

If you use a text editor (I use Notepad++) to edit PHP files and don't add special characters where they don't belong, you won't have problems in the first place.

The utility won't usually find HTML errors - use http://validator.w3.org/ instead.

Thanks for the tip. I use Dreamweaver and I'll definitely look into the link you sent. Thanks.

I use Dreamweaver
Dreamweaver is about as nortorius for adding unwanted stuff as FrontPage.....
These tools are for html pages and not at all conducive to editing php code/text