Electrical Issue???

your ignition switch may be jacked,try jiggling and turning key.If still dead check battery terminals for loose conections or corrosion.
 
Could be the ignition switch and battery connections as Docjohn says. It could also be a short and what you heard was one of the larger fuses blowing (the energy released in blowing a small fuse would be minimal and probably inaudible) . In the main fuse box, check #9 (120 amps), and #12 (30 amps). In the main relay box, check #29 (50 amps). If any of these fuses are blown, do not attempt to fix by plugging in a new fuse. If one of these fuses is gone, you have a serious short circuit and will likely do more damage by doing a test re energization.
 
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