Diablo III was unable to initialize d3d. Click ok to retry

Technical Support
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  1. Copy the URL to the clipboard
  2. Paste the URL into your forum post
  3. Highlight the URL in your post
  4. Click the </> button in the editor
  5. This will turn your URL into pre-formatted text
  6. Whilst not clickable, the URL will be properly formatted so others can copy / paste it like this… http://www.ThisIsAnExample.com/HowToMakeLinks.htm

This is also explained in Writing an Effective Post in the stickied Welcome To The Technical Support Forum! thread at the top of the forum.