No display on monitor, computer runs but no beeps

Hi,

My machine is a Medion MD8855:

AMD Phenom™ II X4 820 Quad-Core
ATI Radeon™ HD 5670 DirectX® 11 graphics
D-Sub VGA, DVI-I and HDMI connection (HDCP Support)
8 GB (4096 MB) DDR3 SDRAM Crucial brand

The problem I am having is the machine turns on but I get no display.
This started happening suddenly a few weeks ago. The machine just went blank on screen, I turned off and reset and since then I have only been able to get it running rarely. Last week I havent been able to get it to work at all.

I turn the machine on, the lights come on, harddrive seems to spin, fans spin. No beeps (normally get one).

I tried taking out the graphics card and turned it on, received 2 very short beeps then 8 slightly longer ones, computer then seemed to start up properly however I couldnt check as I have no display connection except in the graphics card.

The beep code is said to show a bad graphics card or missing card. Makes sense as its taken out, but it doesnt beep at all when its in. From looking around it seems like the graphics card is most likely but I get different errors when its in and out.

Any help would be great!

Thanks