Thread:Project:Support desk/Site "experiencing technical difficulties"-help

Im hoping someone can help. We built a wiki for our website ( http://wiki.dnapolicyinitiative.org/ ) as an educational resource. Last week, the whole thing disappeared and the only thing that shows up is a white page with black text that says the site is experiencing technical difficulties, just wait and reload-except nothing changes. Were not very sophisticated and Im not certain whether its mediawiki or php. Im not sure if its related but the wiki home page kept getting spammed no matter what we did so we changed the setting so only the administrator could update it though every other page of the wiki remained open access. Your help is much appreciated, were currently without an important educational resource for our nonprofits project. Thanks Jeremy