Thank you all for your contribution in trying to let me know what's the problem.
I have done a test guided by your posts. I have tried to start the car several times one after another. I know that the car requires a lot of AMPs to start, so, as you mentioned in your postings, if it was a bad battery, then It would not start after doing multiple restarts. But the battery passed the test!
Now, one thing that I must have mentioned before, the battery comes with an indicator that has a green color when the battery is Ok, but it turns red when the battery gets bad.
Now, I don't know, a friend suggested that it might be a problem in the STARTER. So, what's the starter? and is it an expensive part?