Satellite L450D - blank screen at start-up

Hi
my laptop shows a blank screen totally black on start up the hard drive light is not flashing but I can hear the fan.
Suggestions welcomed

Sounds like a serious hardware problem.
You can check if the issue is related to the display or graphic chip.
Connect external monitor and check if something would be visible on the 2nd monitor.
In case nothing would be visible on the external monitor, your graphic chip (maybe motherboard) is affected

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