Posted 09 March 2010 - 11:36 AM
There are a couple of causes as to why a laptop will not boot with the battery inserted.
1. The battery may no longer be able to accept a charge and is causing the charging circuit to go into OverLoad state thus causing the laptop not to boot with this particular battery inserted.
2. The DC charging circuit may have gone bad and is also causing the very similar condition as a defective battery.
3. The DC Power supply may no longer be able to provide the amperage needed to run the laptop and also charge the battery at the same time. When inserted, the battery overloads the power supply and the power supply shuts down.
I would first try another power supply. Connect the power supply to the laptop and insert the battery with the laptop off. See if the charge light comes on on the laptop. If it does, try powering the laptop on.
If that fails, I would then try another battery. If the laptop is a few years old, it's possible that the existing battery has reached its useful life and will no longer accept a charge.
Hope this helps,
"Admire those who attempt great things, even though they fail."