Ask dell optiplex 390 MIH61R MB REVA00 Bios Black Screen

[Vhatalu480]

Please help Dell optiplex 390 MIH61R MB REVA00 Black screen with (orange light on power button). I have attached original.

 

[ThienBui]

Please help Dell optiplex 390 MIH61R MB REVA00 Black screen with (orange light on power button). I have attached original.