PC boots but no display

[apurocks]

I have a pc with asus m2n68 mbd
amd phenom x2 550 cpu
zion 2 GB RAM.
2 days back when i press my power button pc boots but NO DISPLAY to my monitor comes with HARD DISK LED ALWAYS ON.

I have checked my monitor its fine.

I removed my RAM but no beep.

PLS HELP

 

[Ritwik7]

Are all the fans spinning up? Do you have a graphics card?

 

[9manuals]

Put your RAM back. Tighten video card ( if you have one) on the motherboard, check cable connecting video output to the display. If still doesn't work replace or add the video card.