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then, go out and buy a UPS so power gremlins won't cost you a drawing file.
If none of the in-Acad options will work, ty using one of the other available CAD packages and see if they can open the borked drawing, or find anything valid in it.
A remote possibility: try inserting the "borked" DWG into a new, blank DWG. If it works, Saveas (and breathe a sigh of relief).