As Doc states , that is the chain and you have a fault in that power chain.

I have a simle/quick test that I use to help in narrowing the diagnoses.

Just to the left of the brake master reservoir , you will see a 3 wire plug on the engine seperating firewall... This is starter feed from the cabin and it goes to the starter relay/solinoid. So, you take a jumper wire from the battery pos+ terminal and go to the center terminal of that connector [ it is connector X27, if you want to do a Search]
That will by-pass the ign.sw,NSS and alarm interlock in the cabin..If the starter cranks w/jumper , the problem is upstream from that test point [ meaning in the cabin circuit]..if the starter still does not crank, the problem is downstream from that test point, meaning the starter motor/solinoid/connectons ..or dead/low battery.
If cabin upstream is determined , the first 2 test are fuse #5 and NSS.
Make sure you have a fully changed battery for all test.

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A Dalton