There are several reasons why a 1999 Blazer S10 may not turn over. Some reasons could be bad spark plugs, dead battery, or even a bad starter. A mechanic will be able to determine the cause.
did you check your battery and alternator?
BAttery?, starter? ignition switch?
may be out of timing or check starter
check solenoid
When the battery does not have enough voltage to turn the starter over it will sometimes make a clicking noise.
check the solenoid, and the starter.
Several possibilities: 1) battery does not have enough voltage to turn the starter; 2) faulty starter motor; bad battery connection.
Need more info like, does the starter engage? Does the starter turn the engine over? Does the starter turn the engine over but the engine does not run?
loose wire somewhere from ignition switch to starter.
If a 94 Thunderbird starter will not turn over, the battery may be dead. The battery should be charged with jumper cables.
Are you sure you didn't turn the dimmer down
If it won't turn over then suspect the starter. Check for power at the starter itself.