dead monitor

[shadydawg]

i am not a genius on computers but am really intrested in teaching myself more abouth them so please forgive me if i say anything out the way..
I have a hp pavilion 511n desktop computer an when i turn it on nothing comes up on the monitor i only see that lil line be flashing at the top left of the screen for about couple seconds then nothing no more after that..
i tried using another monitor an the same thing happens when i turn on the pc i know the next monitor is working because i use it on my next desktop..can anyone tell me what is the problem that am having

 

[Atomic Rooster]

When you turn on the computer, do you see any post screens with text before the "flashing line"? Do you hear any beeps?

 

[shadydawg]

When you turn on the computer, do you see any post screens with text before the "flashing line"? Do you hear any beeps?

No i don't see anything just that lil flashing white line...the only beeps i would hear is when i press buttons on the keyboard.