[PapaParrot]

I can't say much based on the screen shot, I think if you can boot using single user mode:
https://www.openbsd.org/faq/faq8.html

Boot into single user mode. This part of the process varies depending on your platform. For amd64 and i386, the second stage boot loader pauses for a few seconds to give you a chance to provide parameters to the kernel. Here you can see we pass the -s flag to boot(8):

        probing: pc0 com0 com1 mem[638K 1918M a20=on]
        disk: hd0+ hd1+
        >> OpenBSD/amd64 BOOT 3.33
        boot> boot -s

Then post a copy of the 'dmesg' output here.


This thread : http://daemonforums.org/showthread.php?t=7196
there is some more information on that, and some other "trouble shooting" commands.
IE: 'man crash'

If you need more details on " how to capture /print the dmesg output to a file or usb device, " so that is can be copy/pasted here, let us know.