Soltek error code 25

i have a soltek sl-k8t-939fl mother board running amd 64 3000+ cpu.
when booting system will not boot the led stops on code 25 then it apears to try again and stops on 25 again i have tried reset but nothing and totally powering off leaving it overnight and trying again but same i have reset bios but same. i have disconnected cdrom, hard drive and taken all cards out with the exception of the video card, still the same also disconnected mouse and keyboard. tried taking memory out but didnt get as far as the error 25.

hope this makes sense and ou can help

cheers andy