It won't start black screen and nothing.
The laptop power on but you don't hear any beep diagnostic also it won't close from the power button when it is on.
It's not quite clear what you're telling us.
Will the laptop power down when you hold down the power button for 15 seconds?
And you can't get into BIOS by tapping on the F2 key when you turn the power on?
No fan spinning? Can you feel the hard disk spin up?
No LED lights on the keyboard?