Nvidia = Light, ATI = No Light - Same code

Nvidia has a reputation for being a little more liberal in their drivers. The best way to figure it out would be to check the debug output. If that doesn't give you any clues, post the pertinent code here.

This is the light Creation code.

D3DLIGHT9 *newLight = new D3DLIGHT9;

newLight->Type = D3DLIGHT_POINT;

//Create a new light, with some default settings, full diffuse and specular with no ambient.
newLight->Diffuse.r = newLight->Diffuse.g = newLight->Diffuse.b = 1.0f;
newLight->Specular.r = newLight->Specular.g = newLight->Specular.b = 1.0f;
newLight->Ambient.r = newLight->Ambient.g = newLight->Ambient.b = 0.0f;
newLight->Position = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
newLight->Range = 60.0f;
newLight->Attenuation0 = newLight->Attenuation1 = newLight->Attenuation2 = 0.0f;

//push the light onto our light vector
lights.push_back((D3DLIGHT9*) newLight);

//set and enable the light
myDevice->SetLight((int)lights.size()-1, (D3DLIGHT9 *)lights[((int)lights.size()-1)]);
myDevice->LightEnable((int)lights.size()-1, true);

Im not setup to get the directx debug output, but I guess I should be.

myDevice->SetRenderState(D3DRS_LIGHTING, TRUE);

is called previous to the create function.

You're getting a divide by zero error, since your light is "falling off" at 1/(attenuation0 + attentuation1*d + attenuation2*d*d). I guess the nvidia cards automatically adjust for that.

Thanks, That was totally the problem