Hi I have an inspiron 6400 notebook, I will appologize for the non technical terms and do my best to explain. When I run my compter without the wall plug (battery pack I call it), it runs fine. My battery pack will recharge my computer as well. The problem is when I try and start up my computer or operate my computer with the battery plugged in my screen goes black, you can hear it working you just cant see it. If I unplug my battery from the laptop and close the lid and reopen it, it is working just fine. Do you know why by battery is blacking out my screen. It is a real pain recharging the computer and the screen is only 1/2 as bright without the battery. tks