07 NBS Silverado No Crank/No Start

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Hey new here, I have a 07 NBS Silverado 4.8 4x4 that has a no Crank no start issue. Never had this issue usually starts right up. So drove to the gas station one night recent and Midway got a reduced engine power and died, would not start back up at all, had it towed and have been checking certain things battery, starter, fuses I've read alot on here and other sites. I figured maybe some insight to my case would be of help. I don't hear a click at all when trying to start it simply does nothing. I've tried a new battery , I've checked cables power and ground cables. Checked mega fuse and lightly checked relays kinda new to the checking relays other fuses I've checked for continuity and they check out fine. I've read about a security issue maybe but I don't have the indicator on my gauge. Anyways any insight is greatly appreciated , I miss this truck it's one string running engine and has got me and my family by for many years.