"No video input" HDMI

[T1ggZ]

Hi guys, i've recently bought a new monitor (Philips E-line 24") and it works fine using DMI which is what im using now but it's on an adapter from VGA. I wan't to use HDMI to make the most of it but when i plug in the HDMI cable i get the message saying that there is "no video input" any thoughts would be greatly appreciated.
Thanks in advance
T1ggZ

 

[OliverDavis]

Press the button that is a circle with and arrow going through it.