i literally just bought a 99 vw jetta, when I went out the nxt day to start it

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the car was literally dead...I jumped it and light all came on including radio, but car still does not start at all...nothing...someone mentioned the security??? I do not have the manual and I have no idea how to handle this...can anyone help??? I tried everything including taking battery out and rebooting it...also locking and unlocking car. there is a blinking light on door by locks,,,i got it to stay steady and still the car will not start...pls. help???