If it's been there for a couple of weeks, yeah, it's stuck. I think the mold on the outside is also a serious red flag. I would A) inspect the beer INSIDE and make sure there's no mold on it. If not, B) make a healthy starter of a high gravity ale yeast or champagne yeast (you didn't tell us what kind of beer it was or if it's even beer?) and pitch that into it. Don't re-aerate (or in your case, don't aerate it for the first time...). Just make a healthy starter and pitch. GL
Edit, sorry, I can see you did say what kind of beer it was. If it was a lager, the high gravity lager yeast I know of is Zurich, but I think it's a platinum strain. Your LHBS may or may not have it. If you don't have access to any of these yeasts, you may as well heat it to the high 60s and pray.