1997 Chevy Silverado - engine turns over but will not fire

If nothing happens when you turn the ignition key to the "Start" position, it means that the starter motor doesn't turn over the engine. Most commonly this could be caused by a dead battery; read above How to check the battery

Seems you have a dead battery. Could be anything related to the charging system (alternator, control, wiring) or the battery itself. It takes a methodic process of testing to determine the cause(s).

Start by having battery tested and charged. If the battery checks ok and holds a charge then "likely" the problem is with the charging system, but it's a multistep process of elimination and very few parts store do a complete full load battery test.

If the battery test fails then you'll need to replace the battery and then promptly have the charging system tested to verify its working or you'll have another dead battery.

Once the battery and charging system has been verified functional you need to have a parasitic current test done. Excessive parasitic draw can ruin a new battery in a few months depending on your driving habits. Is this a daily driver or every other week or longer?

Put a socket an breaker bar on crankshaft pulley an see if you can turn the engine by hand . Motor seized up ?

Key fob battery dead?

Check engine light come on ? You should have some testing done ! Fuel pressure an flow testing , Scan tool data checked . Charging system , battery , connections , cables . What data does scan tool show for mass air flow sensor , what are the fuel trims at ? If you don't know what these are you need to take it to a qualified repair shop .

simply check the battery cables.
I had a 93 s-10.Even a lttle bit loose will cause it
not to start

sounds like the computer is gonna hit the dust! we worked on a 2008 chevy k3500 and it had major computer problems and when we were working on it guess what it craped out on us one day! went ot start it and it was so screwed up that it showed all the gauges messed up and completly dead no ignition nothing!!!
tkae it to a mechanic have them check the computer or selonoid !

You have a new battery and it cranks. Turning over is cranking. You are saying it won't start after sitting for six months? What is an old mechanic? Was the cable installed at home during the one year layoff? It sounds as though you failed to hold the old mechanic responsible for installing the correct cable or adjusting the one you have ,so it will start. You have a safety switch issue by the sound of it. Make sure you have the right cable and then find out how to install and if applicable,adjust properly

check the float on the carb is stuck shut not letting fuel in

Sounds like the ground wire for the battery is not making clean contact. Trace that wire and clean both ends and the area it connects to the engine block. Good luck!