I've been trying to install OpenBSD and the install seemed to go well up until I saw the "bootblocks were not installed" error at the end. I looked online for documentation and found this:
Neither the "boot" command, /usr/mdec/installboot,nor a /boot folder appeared to be on the shell of the installation cd. From the wording in the link above it seemed this might be a separate boot cd. I looked at this mirror:
As I stated, those were the things I tried which did not work. However, it appears there is a hardware issue with my drive. After banging my head for two days failing at installing OpenBSD I then found I could not even install Linux or create partitions. I finally managed to create one 25gb partition and put Linux on it, but could not grow it any further. Now that I know the real problem I'm going to trouble-shoot this more after I've had some sleep.