Since I made updates of software in mavericks macbook pro 1260 does not start anymore

Hi
On my macbook pro A1260 2008, under Mavericks, I downloaded 3 upgrades: Itunes, Ibooks and a security upgrade of 100 Mo. After installation I have been asked to restart the computer in order for the updates to take effect, so did I.... But the macbook pro never started again:  no chime, only dvd player noise, HDD, and Fans.
Could you help me to get out of that mess?
Thank you
C.B

There are a few different startup tricks you can use including safe mode and single user mode. I can never remember what the commands are so try to search for "mac startup commands" to be sure you're doing them correctly. They usually involve holding down the shift key, the R key, the option key or a combination.
Do you have a buddy who can help you build a bootable USB drive? The process is simple and is described on the Apple Knowledge Base article library. There are also some free apps that will do it for you.
Unlikely, but when you exhaust all other attempts, you may be looking at a total erasure of the system so I hope you have a backup.

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