WordPress MU

First of all my hosting company upgraded PHP on the server my sites are hosted on. This killed my wiki. Then I asked them to restore my data from before the PHP upgrade because I felt they might have deleted my wiki pages.

After the restore, my wordpress.quintessentialstudios.net stopped working.

What do I have to do to jumpstart my blog again?

I am not sure if you are in the right forum, this is the wpmu support forum not the wordpress forum. for wordpress head over to http://wordpress.org/support/

if you are using wpmu, give us more details, what do you mean it stopped working???