DX10 Render Question

I've got a simple DirectX 10 3D program I wrote for class in order to display a varying number of triangles on screen then print out the FPS. I'm having an issue when I attempt to print text to screen. My triangles no longer render and I receive the following error messages in my output window: D3D10: ERROR: ID3D10Device::Draw: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. The reason is that the input stage requires Semantic/Index (POSITION,0) as input, but it is not provided by the output stage. [ EXECUTION ERROR #342: DEVICE_SHADER_LINKAGE_SEMANTICNAME_NOT_FOUND ] D3D10: ERROR: ID3D10Device::Draw: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. The reason is that Semantic 'COLOR' is defined for mismatched hardware registers between the output stage and input stage. [ EXECUTION ERROR #343: DEVICE_SHADER_LINKAGE_REGISTERINDEX ] Any suggestions? If I do not attempt to run my DrawTextString function everything runs fine. Code:

void DX10App::DrawTextString(int x, int y, D3DXCOLOR color, const WCHAR* strOutput)
{
	LPCWSTR text = LPCWSTR(strOutput);
	FontSprite->Begin(0);
	RECT rect = {x, y, 100, 50};
	Font->DrawText(FontSprite, text, -1, ▭, DT_LEFT, color);
	FontSprite->End();
}

void DX10App::Render()
{
	D3DXMATRIX mTranslateStart;
	D3DXMATRIX mScale;
	D3DXMATRIX World1;

	D3DXMatrixIdentity(&World1);

	float ClearColor[4] = {0.0f, 0.125f, 0.3f, 1.0f};
	d3dDevice->ClearRenderTargetView(RenderTargetView, ClearColor);
	
	if(myApp->GetTriMode() == 0)
	{
		D3DXMatrixScaling(&mScale, 1.0f / triWidth, 1.0f / triHeight, 1.0f);
		D3DXMatrixTranslation(&mTranslateStart, -1.0f / (triWidth / (triWidth + 1.0f)), (triHeight - 1.0f) / triHeight, 0.0f);

		WorldVariable->SetMatrix((float*)&World1);

		D3D10_TECHNIQUE_DESC techDesc;
		Technique->GetDesc(&techDesc);

		D3DXMatrixIdentity(&World1);
		D3DXMatrixMultiply(&World1, &World1, &mScale);
		D3DXMatrixMultiply(&World1, &World1, &mTranslateStart);
		
		for(int i = 0; i < triHeight; ++i)
		{
			for(int j = 0; j < triWidth; ++j)
			{	
				//D3DXMatrixMultiply(&g_World1, &g_World1, &mTranslateRight);
				World1._41 += 2.0f / triWidth;

				WorldVariable->SetMatrix((float*)&World1);

				for(UINT p = 0; p < techDesc.Passes; ++p)
				{
					Technique->GetPassByIndex(p)->Apply(0);
					d3dDevice->Draw(3, 0);
				}
			}

			//D3DXMatrixMultiply(&g_World1, &g_World1, &mTranslateLeft);
			World1._41 += -2.0f;
			//D3DXMatrixMultiply(&g_World1, &g_World1, &mTranslateDown);
			World1._42 += -2.0f / triHeight;
		}
	}
	else if(myApp->GetTriMode() == 1)
	{
		D3D10_TECHNIQUE_DESC techDesc;
		Technique->GetDesc(&techDesc);

		WorldVariable->SetMatrix((float*)&World1);

		for(UINT p = 0; p < techDesc.Passes; ++p)
		{
			Technique->GetPassByIndex(p)->Apply(0);
			d3dDevice->Draw((int)triHeight * (int)triWidth * 3, 0);
		}
	}

	WCHAR str[255];
	swprintf_s(str, 255, L"FPS: %.2f NumTris: %d", FPS, (triWidth * triHeight));

	DrawTextString(0, 0, D3DXCOLOR(1.0f, 0.0f, 0.0f, 1.0f), str);

	::SetWindowText(m_hWnd, str);

	SwapChain->Present(0, 0);
}