Help Troubleshooting Reason For Computer Freeze

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http://askubuntu.com – I am fairly new to Linux and I am inexperienced in trouble shooting problems behind the scenes. I have a HP nc6320. And I have recently upgraded from Ubuntu 13.04 to 13.10. I have been having issues with my computer freezing. I have changed the memory sticks to a pair of matching 2GB sticks. From the info I have found my computer can handle this much and the freezing problems persisted. So I don't think that the memory could be the problem. One interesting occurrence is that it only happens when my laptop is on battery power it will freeze any time with in 10 minutes to an hour with out fa (HowTos)