Blank Page on show cart

[urbanj]

Hello,

Launch day for my clients new website and it has now broken and I am tearing my hair out.

Yesterday it was on www.domain.com/joomla so I moved the whole installation into www.domain.com

This morning the show cart button has stopped working and I get a blank page.

I have spent all morning going through forum posts and the main suggestion was to upgrade the AIO package to the new version. Clicking the automatic update button resulted in a 500 error. Installing it through extensions manager resulted int he same so I uninstalled AIO.

Now I cannot reinstal it as I get a 500 error and the problem still remains where I click show cart and get a blank page.  We never had any of these problems when I set the website up and the only thing that has changed is we have moved directories.

Any help would be appreciated

[urbanj]

Here is our website if it helps.

http://www.ozschoolwear.co.uk/

It seems I cannot click into any products now without it 500ing

[jenkinhill]

Look at the server error log file to see why you get the 500s.