haven’t got a definitive answer for you but in my opinion first you need to determine if its hardware or software, there are other applications that will tell you if your keyboard is giving an output (it may be working but not know what output to give) i have personally used some gaming software for this in the past (xpadder is one that allows you to assign a key to a controller button i already had it installed but it shows you the key press) but if you go online and type in keyboard tester you should find something similar
if its a software problem and it does give an output but not the correct output then it might be worth going into you’re windows settings and adding a new keyboard layout see if that cures it, might be something as stupid as uk and us layouts being slightly different
if its hardware then really you need to prove if its they keyboard or the laptop, you would have to put either a known working keyboard in (dont trust what people on ebay say iv been scammed before) or you would have to put one of your existing keyboards into a known working system to either prove/disprove this,
if the old keyboard died because of water damage then check the board for corrosion and if found clean off with IPA
best of luck
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