random input

Help my keyboard is acting up, it is suddenly typing random letters like 'y' types y7, and 't' types t4. This happened when I was cleaning my keyboard while it was on, I don't know I broke my computer or pressed something. Sticky keys and key filters are off, I have reinstalled my keyboard...

As the title suggests, I wish to disable my laptop keyboard as I use an external one because the one my laptop came with barely works at this point. For the longest time I just ended up using an external one and just pretended as if the internal one isn't even there, however the internal one...