How come I can't boot into Kernel 15.* series after kernel upgrade Can only use up to 14.9

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I presume that you're referring to the 3.15.x kernel series because otherwise, your question makes no sense. And, unless you can give us some more details, there's not much anybody can do to help you.

Please update ur question with the output of these! rpm -qa | kerneluname -r

There should be some information in the file /var/log/dmesg - if you browse down it and look for any reported failures it might give you enough information to get to the bottom of the problem. If there's stuff there you don't understand, add it to your question and we'll try to help.

@anishjp - i think you mean rpm -qa|grep kernel.

@hello: Yep, missed grep!