What sort of media are you actually trying to boot? Why do you think it's got a valid boot-block? Nope, it's not an error - it's the address the CPU stopped at. It's certainly the case that at address 0, there's a "HALT" instruction (i.e. the contents are zero.) This is very possibly because the boot block you read into location 0 was all zeroes - i.e. not a boot block at all. ----- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology Voice: 301-767-5917 7328 Bradley Blvd Fax: 301-767-5927 Bethesda, MD, USA 20817