My father-in-laws HP 19 all-in-one is getting a secure boot violation - invalid signature detected. I read how to turn off the signature detection in setup. Unfortunately, when I came to his place to fix it, he is getting a keyboard error before that so I can't use the keyboard to get into setup. I tried his keyboard in all of the USB ports on the device (6 in total) to no avail, however, the keyboard works fine when I plug it into my laptop. Any suggestions?
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