Power failure [Closed]

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Greetings, behold I've been working on a Toshiba satellite for some days but no success as of now. Everything has been detached from the motherboard, cooling fan, heat sink, RAM abd even CPU were removed but tge behaviour remains the same.
The board behaves this way: when the powerpack is connected, there would be continuous tiny sounds coming from the graphics chip. When powered on by tge switch, it will power on and off immediately. Same with the battery too. Is there any one there who might be ogmf helped please?