Aporte original por: Xen ,
Ok so if you have already ruled out the battery than it could be one of a couple things. Since you also reset the smc/pram then the next thing I would test is a new adapter. If you have tested a new adapter and it is not working either; at this point the computer itself would be at fault and it would most likely need a repair. Most likely either the smc itself or the board would need replaced.