I have an old HP Laptop with XP that has died. The battery has been bad for a long time and I am feeling that this has caused the problem. It has shut down on me many times in the middle of use. This time I was doing a full MSE scan. The system was just cleaned and debugged, defragged, cleaned disk, boot time scan etc. What is my next step, not sure I wan to buy a battery if it wont work when installed. If the power cord is an issue maybe I can check it with my multi meter if I knew what to check. Thanks in advance.