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This sounds to me like the antitheft security system. If the computer doesn't read the transponder frequency coming from the key, it goes into anti theft and shuts down the starter and/or the injectors. If it starts for 1 to 5 seconds and then shuts down, its probably this. Read up about this on this link, it gives you symptoms and causes, plus a "do it yourself" solution if you decide that this is the problem. I've been dealing in GM vats-passlock-passkey securities for quite a while now. From your description, I'd guess this is the issue. http://vatspasslockpasskeysecurityhelp.yolasite.com/
Sounds like the fuel pump going bad. You will need to check to make sure you have the correct fuel preasure for at least 10 mins. You can find a fuel preasure tester at any auto parts store. Same thing happened in my 2002 Escalade, replaced the fuel pump for around $650.00. Good luck
Get in the car and turn the key on, but do not start the engine. Do you hear the fuel pump running? After it runs for a few seconds, try to start the car. If it starts every time, then the symptoms you describe combined with the test indicate a failing fuel pump. Sometimes you can get codes from the cars computer which also provide some indication of what's failing. It could also be the fuel pressure regulator on the injector fuel rail
It could be the fuel pump pressurizing the system. Does the sound stop after a few seconds? If it is the fuel pump then it is a normal sound. Fuel pumps will resonate in the tank when you are low on gas, making them sound louder. If it is more than a hum then I would get it checked out.
check the fuel pump. there is an access port on the fuel rail underneath the intake manifold cover. it looks like a valve for putting air in a tire. at your local car parts store you can find a fuel pressure guage to make sure your getting the 45lbs psi that is needed to run the fuel system. if your not getting 45psi when you crank the engine replace the fuel pump. it is located in the gas tank. ( FYI ) If you run below a 1/4 tank of fuel the fuel pump is no longer covered with gas, and over heats. thats why most of the gm pumps go bad. D
If you can get a rubber mallet under the gas tank,,rap on the underside of the tank as someone else tries to start the car. Sometimes this is enough to get the pump working again. But it usually is a temporary fix and you need to have a new pump installed.