Intel d 865 gsa mother board is working but not display no beep what is the problem

I thinks it's not working, check again.....
no display, no beep.....simple symptom of a dead MB

the quality of the MB is all components will work together, even if one component in it fails the MB is dead.....

this rule is not applicable to the following devices in the MB
inbuilt sound cards, or
either of the USB ports or
mouse port, keyboard port

As you can use an external device like a USB sound adaptor insted of the internal sound card for your speaker/sound.
The same goes for mouse and keyboard, you can buy keyboards/mouse that work thru USB
The same is of a USB port, if one of the USB ports fail you have the other ports to use, if all of the USB ports fail then you can use a external USB connector to a LAN port and make the LAN port a USB device.

also.....there is no option..... that you can change one of the components.....they all are embeded in the circuit board, it's cost effective to get a new MB than repair the defective component.....

all the best