Old gateway keyboard not working?

A while back, my friend gave me an old Gateway system (not sure of exact model) but it bluescreens on startup. I was going to reinstall Windows 98 from an ISO burned onto a cd, but the keyboard isn't working. The Num lock, Caps lock, and Scroll lock lights light up one after the other, but the keyboard doesn't respond. I have tried 3 different PS/2 keyboards, but none of them work, and I don't have a usb keyboard. Wat do?
 
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