No problem with customs or security, I bring my laptop with me all the time and I fly to the US at least 4-5 times a year.
You will need a plug adaptor (from Irish plug -> US plug) that you can buy at Dublin airport.
Customs may ask to have the battery in your laptop removed for inspection, and you will always have to go through security and place your laptop in a separate container, but that is all.
Your machine will work perfectly in the States.