MacBook Pro doesn't turn on after 10.7.3 update

Hello,
Recently I have updated my macbook pro (15-inch early 2008) with OS X Lion to 10.7.3 version. After the computer restarted and installed the update it turned off, then when I tried to turn it on and it didn't do, do you have a similar issue after 10.7.3 update?, the screen never turns on and I can only hear the sound of DVD drive and immediately turns off, can you please help me to solve this issue? Thank you very mucho for your suggestions

Try these three things in this order:
Reset your computer's PRAM
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Mac OS X: Starting up in Safe Mode
http://support.apple.com/kb/HT1455

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