It would also help if you could tell us about any Windows error or warning messages which might have appeared before this situation with the black screen started.
It's also possible that your laptop is booting but that the screen is dead. Most laptops have a tiny battery source which powers the screen display and if this fails it stays black. Unfortunately, in some cases these are not replaceable, depends on the make and the age of the machine. To check this, switch on and then either shine a powerful torch onto your screen or take the laptop to a really bright window. If you can see a feint shadow of things on the screen then it's the screen itself and not the system.
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