My car would not start, no crank no dash lights dead. New battery

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Started car previous night and radio would not work, anti theft light on radio blinked while car was running. This morning car started right up but again no radio. Left work tonight and turned key in ignition and nothing, no crank, no dash board lights. Tried to start 5 time over a half hour and then car turned right over and radio prompted me for code and worked. Any ideas?