PC black screen.

[Senkyuhiyakukyuju]

Hello.
I had this PC for 2 years now, suddenly last week when I boot it up, it doesn't show any image, I tried on TVs monitors everything.
I would like to know what component you think causes that.
Sometimes it even beeps 8 times. And the keyboard doesn't even light up, so it gets worse (Number pad and such.)
And everything works, LEDS fans, all of the lot.
Thanks.






















HP pro 3400.
Gtx 750.
Pentium G630.
6GB of ram.

 

[Tumeden]

This may be of use: http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c04224518-1.pdf
Page 257 shows beep codes for HP computers.