Indeed, you should always try a snapshot if you suspect the problem may be with OpenBSD. They represent the latest code available.
This system is 64-bit compatible, OpenBSD/amd64 may work where OpenBSD/i386 fails, as they are treated as completely separate systems and do many things differently.
It should also be noted that Acer has a BIOS update for the Aspire 9300, you can find it below.. it is possible that the problem was on their end.
http://support.acer.com/us/en/produc...=5&modelId=135
or
http://global-download.acer.com/Step...&Category=BIOS