Cant get anything when i use the two hdmi inputs in and one hdmi out to a monitor

First thing to check, If you turn your monitor on to the correct input you should be able to see an immage from your receiver. It may be a setup screen, blue screen or flash as you change inputs on the receiver. If you do not see anything from the receiver check the HDMI cable from the monitor out of the receiver to the input on your monitor. Next is the setup of the DVD player and the Yamaha receiver. Check that the receiver HDMI ports are turned on and assigned to the correct port. Check that the disc player is setup to out put HDMI and that formats like DTS are turned on if your receiver supports this. This will give you the best picture and sound out of the equipment you have. To get in to the set up of your DVD player and receiver and use the on screen display you may need to connect them to the monitor with a composite video cable first. Make sure the monitor is on the correct input. Once you have finished the setup you should be able to switch the monitor back to the HDMI input.