Light display a green light, no show.

Chassis lit fan, CPU fan is operating normally, the fan card is operating normally, the board of a bright green light.
HuntKey the chassis, E8400, Sapphire HD4850.Motherboard P5Q.LG19-inch LCD.500G Seagate hard disk .HuntKey multi-400W power supply.

Monitors connected to the power supply, the bright yellow light.Open the host, a green light, the keyboard does not shine, the mouse does not shine.Display do not show anything.

Do not know what the problem is.Please help you.

First rule out the possibility that the keyboard and mouse problem is not hard to see
Look at the issue of the interface data transmission line display and host data did not take a good line, to re-take a look at the situation there is a lot of reasons.Suggest that you try to use substitution law.I feel fine display.Graphics cards to play out like ~