Is the Security light staying on for an extended period of time while you are trying to start it?
Have you checked for spark and fuel?
Is the fuel pump turning on when you turn the key to the "on" position? You should be able to actually hear the pump kick on, especially if you are under the car while the key is turned to the On position.
You chould also check the fuel pressure at the fuel rail, on the fuel rail is a little valve, very smiliar looking to a tire valve, with a plastic cap over it, you should be able to push in on this with a small object like a screwdriver to make sure you have plenty of fuel pressure, an actual fuel pressure gauge would be MUCH better, but the other way will work just to make sure you have pressure...you should be getting somewhere around 35-40psi of fuel pressure if its working properly...those are figures pulled out of my butt, but im sure its close....also wear proper eye protection when doing this, and make sure you have a rag around the valve area, as fuel will be spraying out of there and you dont want it all over your engine.
2000 Oldsmobile Intrigue 3.5L DOHC V6 15x,xxx miles "The Forgotten W-Body"
shaved badges, Eclipse HU, Pioneer TS-A1370R'*, Pioneer TS-A6971R'*, 20% tint, cleared corners, Silverstar Hi'*, 9005 Low'*
Fenderwell Intake, Hi-Flow Cat, U-bend delete, GMPP Handling Kit, MOOG endlinks, and 12-inch front rotors
1996 Bonneville SE RIP 157,751 miles, totaled 8/29/05