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.