My laptop won't turn on.

Hi everyone, I have a problem with my MSI Raider GE78HX 13V laptop. I did some maintenance today—just cleaning it, which I've done before. I made sure to put everything back in its place and connect everything, but now I can't turn it on. The power button stays lit red and a fan turns on, but the screen doesn't display anything, and it seems the keys aren't working either, since the Caps Lock key doesn't light up when I press it.