I don't get to a terminal, but the dmesg is at the relevant lines I can think of (copied by human):
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 21, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 LoadTable panic: aml_die aml_parse:3992 Details: This happens using both the mini installation media or the full installation media, version 5.6 for amd64 copied from ftp.openbsd.org The hardware is an AMD, 64 bit Thinkpad Edge E545. I am booting from a flash drive (if that means anything). The current hard drive in the system is totally blank. Same error on mini install media from the 57 snapshot, with an altered line number (3986 instead of 3992). Thank you.

