1999 Nissan Altima car won't start

How was the security system disengaged and for what reason. Foriegn cars were the first to impliment an ignition cut off for the security system. This way if someone tried to tamper with the system the car would not start unless the system was completely bypassed. I would most definatly hook the security system back up or consider taking the car to an electrician to have him completely remove or bypass the system.

That security light does nothing, just a thief deterrent, see below what I have described, sound like it too.
Hi, I have had a similar issue, took the car to a shop they replaced a bunch of parts that they said were definitely bad, but thats another story, they gave me a BS story each time they replaced something, and I am talking a reputible shop in town here, not some joe shmo, found the issue myself after doing some thinking, if you cannot start car, have someone else turn key for you and you listen from backseat with the larger half of the seat folded forward, the fuel pump is right below where the velcro connects the trunk carpet right below there, but to get to it back seat comes out, along with the round pressed metal surround under the plastic pieces there along with them. Anyways listen for the fuel pump as the other person turns key, you cant do this test yourself. If you hear nothing, its most likely it, try a few times, then get out and rock the car back and forth a couple times from side to side, at this point the wire which is half broken inside may align itself, try listening again, if you are able to start car, then get the sending unit or fuel pump harness kit, forget which it was, but the wire that is bad is the one that connects to top of the fuel tank seal and the other side to the fuel pump. I hope this saves a lot of headaches for everyone, and I can't believe that nissan doesnt even have this documented. Definite design flw, basically what happens is while driving the sending unit along with fuel pump are suspended by 2 fuel lines and this wire harness, and it, just like any piece of metal eventually partially breaks when folded back and forth a thousand times.I dont believe you can buy the cable itself, it comes as a part of the kit or sending unit, one connector is flat, other square with rounded corners, I believe around 80$ bucks at nissan dealer only. Good luck, let me know how it works out.
-Miro