Thank you very much, but I solved the problem. Turns out it was a series of bad luck, namely a whole series of bad floppy disks. Every single disk that I had was bad so I bought a new set and it worked beautifully! I was very surprised!
Note to anyone else who has this problem. The BIOS for the Syntax SV400 is actually the BIOS from the SV400A. I've tried flashing the BIOS with the SV400.ROM and the system locked up so use the SV400A BIOS. They both have the same filename so make sure you download the SV400A BIOS
Thanks for the help, maxim!
Love&Peace!