I have an Inspiron Mini 910 that until last week was working fine. Now the Battery Charging light does not come on and the Battery will not charge. I thought perhaps that the battery was dead and so purchased another one at a cost of £73!!!!. Did not so;ve the problem, the new battery is now not charging. If I remove the Power Cord the Laptop turns off straight away It will not run on Battery at all. What is the problem???????