I'm running a Linux Centos 5.5 x64 server with no physical monitor attached and an NVidia graphics card (using the latest linux drivers). I am accessing it through ssh. I have some software that uses the NVIDIA card to perform calculations, but it won't work because the X server is not running. Running startx gives me an error that no display devices have been found. Is there a way to start the x server without a physical monitor attached to the machine? I've had the software work before by plugging in a monitor and then disconnecting it, so it does not need a screen attached to work, but I don't have physical access to this machine at the time.