Site Has Disappeared - white screen no errors

[sootski]

I have been thinking about upgrading to the new version. At the moment I am on 1.5.6.2, so I upgraded modules and looked at the one click upgrade. I put the site "under maintenance" and tried to upgrade. Nothing really happened. So I reset the module then uninstalled it. When I tried to reinstall it kept failing

 

2 errors

1. Error on downloading the lastest version
   
2. Module not found
   

I decided to leave well alone and re-enabled my site. But its now just a white screen?

 

http://shop4utax.co.uk

 

The mobile site is still visible though

 

Anyone have any ideas?