Hello everyone. I have an old lenovo thinkpad r61 laptop that has been charging for about anywhere from 5 seconds to 15 seconds, then discharging and the icon will show that the laptop is not plugged in then about 2 seconds later, repeat that same exact process. I know for a fact it is not the ac adapter because I have another computer that I use this adapter with and it has no problems and the adapter makes no clicking noises or hums. but only when connected to the r61 gets very hot. I would like to know how i can tell if this is a problem with the laptops power connection, battery, or perhaps both?