Suddenly: black screen with power and work lights on.

I have a big looking good Toshiba laptop, and any advice of how to bring it back to life will be much appreciated. Laptop reacts on power button. It is turning on and after pressing 4 sec, off. Next I have used method of pressing power button 60 sec with extracted battery and while laptop is unplugged. Next I used external monitor. I have another working laptop, exchanged RAM memory. RAM is fine. Before laptop crash the battery was dead, absolutely no any charge was in it after I have unplugged it from power supply. May be this became a reason of it's failure. And one more. the behavior of the laptop with pressing the power button is the same, main processor is placed into motherboard or not. I think motherboard is dead. This site is the last hope.

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