When trying to turn on my laptop using just the battery, the lights and fans run, but the screen and all other operations do not work.
When the power cord is plugged in, the laptop works fine. It will boot normally with or without the battery as long as the power cord is plugged in. If I unplug the cord while the computer is running, it will freeze in a couple of seconds.
I have tried a new battery and re-installing windows, which did not help.