What happens if you
- switch the computer off
- take out the battery
- plug in the charger
- attempt to start the computer.
Does the initial flash screen appear on the display? Can you go into BIOS by pressing the key indicated on the flash screen? If you let it boot, does it show the Windows logo? Can you go into Safe Mode (press F8)?
I have a similar situation. Dont know answer. If started on battery alone, it starts after a minute. If started with direct power connected, no sign of starting at all even after 10 mts. Power is charging battery correctly. Battery helps starting computer after a random of 1 or 2 mts of power switch on. If direct power connected while on, it freezes. Help will be appreciated.