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Macbook not re-booting after installing the upgrades

Time:November 30
Yesterday i did the latest upgrade on my macbook. i was then prompted to re-boot which i did. but now after the reboot all it does is that shows me my background screen for a second and fades back to the blue screen non-stop. i counted 10 repeats of that before i manually turned it off. any ideas?
In the future I suggest that instead of relying on Software Update to do the work you go to Apple Downloads site and manually download and run the updater required. Also If it's a system update repair disk permissions before and after. Some think it's overkill but better safe than sorry.
Try booting into the Safe Mode which automatically does a file system check and repair. It may take a while for the boot to finish as the file system check and repair will take some time.