When I press the power button on my laptop it doesnt do anything. When I plug the ac in without the battery the front red light flashes a few times but nothing else. When I put the battery in my laptop with the ac unplugged, the lights automatically turn on and the fan starts up but this last only a few seconds and then it turns off again. The power indicator on my battery says full charge and when I plug my computer in with the battery installed the light comes on that says it is charging. Please help.