2003 Oldsmobile Won't Start

Try giving the steering wheel a wriggle left and right as you turn the wheel. Sometimes the steering lock pin has to much force on it to move easily.
Other than that the gears on the starter rod may have jumped or warn and will not mesh. That would require the steering wheel to be removed to fix.

The light and the word stop should be sending you a clear message . The engine hard starting and sluggish is also sending a message and if you do not heed the message and have the fault codes read and the problem fixed then the next message may be replace the engine or gear box . The light is there --not to be an annoyance ---but to inform you that something drastic is going wrong and it needs urgent attention.

Chances are you got water inside the fuse box or a wiring harness connection.
You may have to start tracing circuits to find out what is getting power and what is not.

Fuel system. Probably pump or something related.

Try Changing the fuel filter, if this does not work check for spark. Hope this helps you.

If the security light keeps flashing,you might as well do a reset.
Be sure to turn off all the accesories including the radio before you start the process.
Insert the key to the ignition switch and turn the key to ON position without starting the car.
leave it ON until the flashing light (security) stops.It will take approximately 15 to 20 minutes.
As soon the flashing stop,turn the key to OFF
position and start the cart.
Hope this help.

It could be a number of things. Have you tried to run any codes yet?

u need to scan vehicle for bad codes--the system is runnin to lean at start caused by some sensor issue-while at a parts place take a look at a haynes manual

Try replacing the air filter.

I am having the same exact issue right now with my 01 Alero. Been having electrical issues with lights coming on and off. ABS was kicking on a few times even. It started sputtering like it was running out of gas, thought that might have been the case. But after I put gas in it it still didn't start. Now it turns over but nothing. What ended up being wrong with yours?