Displays, RH3 only right display is working

Symptoms/Issue

only one display is working.

it may be the bios battery has failed and the bios settings have reset.

as a test reset bios settings, especially the Graphics Adapter.
if the bios changes solve the problem, check the bios battery on the motherboard, it may need to be replaced.
the bios document with the correct settings can be found below, and on the High End site under Legacy Products.
there were two motherboards used in RH3, settings for both are included.
if the model is not known, comparing what is in the Advanced tab to the document will be easy to determine the correct board.