I have a Compaq Presario v2000, sn CNF55116NW , Model EP378UA#ABA. My AC adapter connector end, the end that connects to the PC, melted the yellow insert in the connector. I noticed that I can run the laptop with the battery out and the AC plugged in and there is very little heat. However if I put the battery back in and it begins to charge after about 15 or 20% of charging the end gets hot and after about 40 or 50% the end is extremely hot. I know that when the PC is in use and if the battery is charging and the PC is being used the AC adapter will heat up but to have the connector end to melt the yellow insert appears to be way too hot. When the battery reached full charge the connector cooled off but when I pulled the connector end out of the PC it was stuck, hence the melted insert. The battery ran the PC OK and the charge dissipated about 15% in about 20 to 25 minutes. Could my battery be bad or is it the motherboard?