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Has it always only charged with the battery when it is closed, because that is very unusual. Most likely your li-on battery is dead or only holding a minimum charge. Most older laptops will not run without the battery or if the battery is dead. if the battery is not good it will not power up. You need a new battery, or get that one rebuilt at batteries plus or sonewhere.
It sounds like you either have a dead mother board or a bad power inlet. Did the machine work with the new battery while it was charged? If so, then the battery connector was good and the inlet was bad. If not, your motherboard could be dead. I've also seen where a bad battery connector would syphon off enough power to not power on the machine or charge the battery.
As lond as the battery is still accepting charge from the charger and will run ok on a battery, I wouldn't worry. Pulling the AC power cord isn't a good idea when the laptop is running anyway.
However, what you describe sounds like a dead battery that will no longer accept a charge. Even a battery showing 100% charged can still fail, as it drains in seconds if dead. What kills most batteries is leaving them in the laptop afetr they have charged and running on ac power.
If you battery is totally dead you need a replacement unit - remove the battery power the unit up using external power pack then refitt the battery - if it won't charge the battery is dead. get a new battery
when you plug the power cord check and see if the battery shows that its charging ,if the charge level is low allow it to charge fully ,after its fully charged remove the power cord and see if it will go of again .if it goes off then you know the battery is dead if not it might be of low charge or not properly fixed.hope this helps
Check the wall outlet where the Power Transformer is plugged in and verify that it has current by using a lamp or something like that. If ok, then... Check the laptop battery for charge state. The indicater light should show full or good charge. If not, the battery could be dead.... If no current from the adapter, the battery goes dead in 2-3 hours of use.
Both batteries could be dead. But if you bought a new battery, it's unlikely. I don't know what green light you see, but if it's on the power adapter, it just means it's turned on--not that it is charging. Two possibilities: Your power adapter is bad or the motherboard is bad. Because you say the computer works if plugged in, then you have ruled out the adapter. You should be checking/cleaning the battery contacts and if all else fails, going for a new motherboard.