I have a late 2008 MBP that occasionally would not charge. The charger had a faint green light. If I left it alone it may in a few days it would start working. This time it would not start charging again. I went to best buy and bought a new charger, still not working!!! I read several posts about the magsafe board being bad. I did read one post about pulling and reseating the ram modules. I pulled my ram, put them back in and it staring working immediately! Who knows why but after resetting pram and every other reset from Apple, still didnt work but pulling ran did.