Could anyone tell me where I would be able to purchase a replacement Power Button Board, part# PWB X8683 rev A02, for my Dell Dimension E510 desktop? It has 2 USB ports and 2 audio ports. I did a Google search for it and nothing was found. Looked on Dell website about parts and no results either. Maybe the board is given another name.

You have to get it from Dell. Give them a call.