I've just shut it down (it told me that some background software needs to be closed first but I was in a hurry and clicked the force shutdown button) and the next day, when I tried to turn it on it started behaving like I mentioned.
Usually, when you force a shut down like this (when you shouldn't) the only thing at risk is your Windows installation being corrupted. It really should not have been an issue with your hardware or firmware (BIOS).
On the other hand your screen not displaying anything is a hardware symptom.
Of course you tried reaching the BIOS using F2 at power on and that failed too?