Yeah, if the power supply suddenly went from working to not working, I'd guess that you did something to the AC adapter jack on the empeg which shorted it out, and (as said earlier in the thread) probably popped a fuse on the power supply or maybe burned it out.

Did you replace it with a proper replacement jack, or did you try to repair the existing jack? If the latter... DON'T. Just get the proper replacement part and put that in. I'm pretty sure I've got links in the FAQ.