My laptop keyboard stopped working after my cat sat on it. What should I check?

Start with the low-risk checks: restart the laptop, then see whether an external keyboard works. If you can, check whether the built-in keyboard responds before Windows loads, such as in the firmware setup screen. If it works there but not in Windows, look at software or accessibility settings. If it fails there too, a hardware issue becomes more likely.

The exact model matters because special keyboard-lock features are not standardized. Avoid taking the laptop apart unless you are comfortable doing that and have the service instructions.

One quick test is to try a different operating system from a temporary USB environment, or check the keyboard outside your usual Windows account if that's practical. If the keys fail in more than one environment, that points away from a Windows setting or driver problem. If they work elsewhere, focus on Windows settings and drivers.

If only a few keys are affected, debris or damage under those keys is also possible. Air may clear loose dust, but don't pry off keycaps unless the laptop's design supports it.

Don't assume the cat triggered a magic disable shortcut. On many laptops, a keyboard that goes completely dead can mean a connection or keyboard hardware problem, especially if it doesn't work before Windows starts. A repair shop can check the internal cable and keyboard without guessing at random key combinations.

If there's any sign of liquid, power the laptop off and unplug it rather than continuing to test it.

Before anything more involved, do a normal shutdown and restart, and check the laptop maker's support page for the specific model. Some models have special function-key behavior, but there isn't one universal shortcut that locks every Windows laptop keyboard.

I would not remove the battery or open the case just to try a reset. Follow the manufacturer's instructions, or get help if the keyboard remains dead.