New to DL3

Picked up 4 DL3's for $50 each. The display lights up, however I never see a splash screen or anything on it. I don't know if my video card is bad or if it is the hard drive that will need to be re-imaged. Any help is greatly appreciated.

Also, how likely is it that the video card failed?
What are compatible video cards for the unit?

Lastly, if I have a working hard drive, is it possible to clone the drive to a SSD and run that instead--just because of vibrations and the rigors of the road.