My initial problem is:

A TPM error (7) occurred attempting to read a pcr value

Some of the suggestions on this involve disabling or enabling TPM. However, I have looked over the BIOS screens on my HP EliteDesk, and they do not seem to have such an option, or it is named something else.

I next tried reinstalling CentOS, but I am getting the error

"Can't read kernel : /images/pxeboot/vmlinuz".

The only suggestion I can find says to disable secure boot, but this is not enabled.

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