Cant see post

[drmmrx4]

my comp turns on but i cant see the post screen i have tried 2 keyboards to press tab (the button it says to show post screen) n nothing happens it starts beeps once n the abit logo shows up thats it...

 

[drmmrx4]

n now that i changed the mobo to a msi k9n neo that i know works i got nothing no beeps nothing on the monitor...nothing....n the abit mobo is a an-m2hd