Are the battery leads making a tight contact? - check
Is the starter motor stuck? - give it a gentle tap with a hammer.
Group 75.
check ecm fuse
Could be, bad battery, bad starter, in need of tune up, need more info.
generally that you have an electrical issue, either your battery is dead or dying, or it could be your alternator also... make sure you have booster cables in your vehicle
it could be the started is shorted out because of the battery being connected backwards
ALTINATOR OR STARTER. JUMP START CAR, TAKE POSITIVE CABLE OFF BATTERY,IF CAR DIES IT IS ALTERNATOR. GOOD LUCK
It could also be a corroded connection, the fusable link or the keyswitch.
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Battery cable connections may not be tight. The starter could be bad. The starter solenoid could be bad. Check to see if the lights work. If they do, leave them on and try to start the vehicle. IF the lights dim, you have a bad battery connection somewhere or a bad starter.
There are many places where one could find maintenance tips for a 200 Chevy Blazer. One could check websites such as Fixya for information regarding maintenance on this vehicle.
Could be the driveshaft.
I would like to know if my 2002 chevy blazer with a stock 4.3 vortec pull 2000 lbs ?