Year and model might not be relevant but then again it might be. A bit of an introduction never hurts, particularly if its your first post and looking for help.
I know my 2015 doesn't have any conventional type fuses, all circuit protection is electronic as the previous poster mentioned. What areas of the bike were damaged and have you worked on? Always assuming that the battery is fully charged and connected correctly then personally I would begin by checking that the central chassis cpu is connected correctly, visually check the wiring under the seat and tank and the ignition switch. There's nothing particularly special about the hazards as to why they should continue to work when nothing else does afaik.
You do have the correct 'chipped' key for the bike I assume? My bike was an insurance write off that I bought at auction and came with two BMW keys but that isn't always the case.