I have your same problem with my mobo, I recently purchased a XP 2100+, I sent it back to replace it and they sent me a model 8 (0.13 microns) version. My ECS K7VTA3 v2.x supports model 6 (0.15 microns) but the model 8 not. I don't get video signal and my keyboard's num lock key doesn't work. You should go to amd's site and check if your mobo supports your cpu:
http://www.amd.com/us-en/Processors/Pro ... 8_756_3734
You should also check your power supply, sometimes the psu doesn't provides enough mA to support the CPU.
PS: copy/paste the link don't click it.