HI, I suggest you take out the 650 Duron, get a good magnifying glass and inspect the silicon in the center of the CPU. If any of the edges have the slightest chip, gouge, crack, etc., the ship was physically damaged and will not work. You may have to clean off the thermal compound first to get a good visual. If there is no thermal compound to clean off, that could be a problem and cause burnout. I would suggest the same careful examination of the Athlon prior to installation. Make sure there is plenty of compound for thermal transfer to the fan. Make sure even pressure is used when mounting the fan. Uneven pressure is what causes cracks and breakage. Thanks and have a Great Day! Joe Lore ========== Subject: [PCBUILD] New PC Build: ECS MB, 650 Duron, 128MB 168pin SDRAM Ok, now for my kids system! :) I am trying a new motherboard brand: an ECS K7S5A Pro Rev 5.0. It has the option of SDRAM PC133 or DDR. I have 128 MB SDRAM. I was attempting first with a 650 MHz Duron. All connections and jumpers have been checked and rechecked, but when I power up, no display is received whatsoever. No floppy drive seek or LED. No HD action (by ear or LED). Only the power LED lights up on front. Reset button does not respond to anything. I backed up, by pulling power and data connections to all drives and attempted to see if I can at least get some BIOS to the screen. Nope! Notta! Zilch! There are NO LEDs on this MB so I cannot get any clues there. I do not get any diagnostic beeps either. My guess at this point is the CPU is dead. I got it free from a colleague at work and therefore I have no idea of its true state. I have not seen it in action on any other system. I am reluctant to put my Athlon 1.2 GHz in there as a test. Would there be any harm in doing that? Of course, I gotta be careful with the sink/fan/grease in moving it. I just do not have a ready supply of CPUs to test with. Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml