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You may have the wrong AC adaptor, Dell is very picky when it comes to Power adaptors, it must be original OEM Dell for the laptop to recognize it, any after market no name brand even though it has the right specs and is made for your model will power your laptop but the circuit to charge your battery will automatically be closed
Sounds like you have a broken AC plug. You can buy them cheap and disassemble the laptop and soldier the new one in but unless your electronically capable I wouldn't try it yourself. You can Google your laptop model number and watch videos to help if you insist on doing it yourself.
You say you bought a new adapter--was is a Toshiba adapter? Was it a "generic" one? You have to be careful, because some adapters have different polarity and could damage the computer.
If you are sure the adapter is OK and is putting out the correct voltage (~18 v.) then disconnect the battery and try running the computer without the battery just using the adapter.
I don't think this is a BIOS problem. The operating system should not affect the function of the adapter.Most likely you have a motherboard problem if all else is working.
It should boot when connected directly to the power outlet through the laptop adaptor. If it is not boot, then the adaptor might not be supplying the needed power to boot it up.
If it is possible, try to isolate the issue. Charge your new battery using another laptop. Then plug it in your laptop to see if it works. If it will work, then it is the AC adaptor of your laptop that is defective. If the charged battery still won't make the laptop boot, then there is something wrong with your laptop hardware. If could be a motherboard issue of your laptop.
Try to connect the AC adaptor of your laptop and plug it to the wall outlet and let it charge for 3 hours or more. When you plug it on the wall socket, it won't show the laptop's led blinking since it was totally drained. But after 3 minutes or more, it will start to show the blinking led to indicate charging. When blinking stops led light disappears, it is fully charged and ready to use.
Remember: Do not use your laptop while it is plugged in to save your battery life. When at home, remove the battery while it is fully charged and plug the AC adaptor directly to the wall outlet. It will still work without the battery as long as it is plugged directly to the wall socket.
I would try replacing your ac/adaptor (power plug) before troubleshooting any further. It sounds as if the adaptor is faulty. Check eBay, you can get a replacement for less than 10 dollars.
You may be able to get a battery charger but its rare.
If you do wish to use the AC adapter, take care with positive and negative. Also the voltage of the battery is actually lower than the AC adapter in order to get charged. I don't know what is going to happen if you do choose to use AC adapter as battery. 75% chance that it will work.
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