I just bought a DP55KG, processor and memory to update my system. At boot-up the board would stop at the same "4F" error code with no display, and would continually cycle on and off for a while and then just stop at 4F with no display or drive action. I had to go through the BIOS recover sequence with the latest BIOS loaded on a CD. After that it worked great. Getting the CD in was a challenge. You have to catch it between power recycles and then just leave it in and cycle power yourself. Make sure you use the ".BIO" file to load the BIOS.
hi, what's your processor and memory installed ? 4F seems to refer to a proc issue.