OK sounds like the graphics card to me.

Best bet is to unplug everything from the motherboard and i mean everything and then plug it in in the following order


CPU, RAM, PSU.....power on and check you should get some sort of beep with this. Remember the pattern for the following..
Next add the graphics card, you should get the same pattern of beeps as the one above. If you do then your graphics card is shot time to replace,
next add the sound and check
Drives next

Remember to power off before adding anything,

Hope this helps if you need anymore advice feel free to IM me.

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