I have put mac os update from 10.9 to 10.9.5 from mac app store but system do not restart and monitor shows no signal?

Hi All
I have put mac os update from 10.9 to 10.9.5 from mac app store. Update wants restart and I do that. First it shows installing updates on monitor and then after waiting for more than 30 minutes, it did not restart. On monitor it shows no signal now. I have checked all the connections. Mac mini LED light is showing blue color and i think its signalled the ON mode. Also mouse lights are on. Please provide help, as I need to solve it asap.
Thanks

Boot to recovery and first try repairing the startup disk via dis utility.
Next reinstall the OS via Recovery
OS X: About OS X Recovery

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