I had the same problem but i found the solution and WORKED. Needed only 1 minute. I copy-paste:1. Disconnect your AC supply
2. Shut down computer
3. Remove battery
4. Connect your AC supply
5. Start-up computer
6. Open Device Manager (type in device manager in the start menu)
7. Under the Batteries category, go to "Microsoft ACPI-Compliant Control Method Battery"
8. Go to the Driver tab and click Uninstall (it's ok - it will re-install on re-start)
9. Shut down computer
10. Disconnect your AC supply
11. Re-insert battery
12. Connect your AC supply
13. Start-up computer
14. Put a smile on your face when you see x% (plugged in, charging)
Battery is weak , replace a new one
Battery is dead!!
It sounds to me like some of the cells in the battery has collapsed.
A 12 volt light doesn't use as much juice on the battery as when you boot up. When Mobo, Monitor, Harddrive etc etc. start up they all use a large start-up-current and if the battery cant sustain the amount of amp. they all need together, nothing happens.
This is called shadow-charge, the battery seems fine, but when it really needs to put out some power it collapses.
I think you should try to sniff up another battery and see if this one has the same problem.
Or perhaps investigate wether or not you still have some warranty left on the battery, to try to get a free replacement.
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