(Redirected) Alienware X51 Desktop keeps freezing and crashing

I have had issues with my desktop crashing before, but very rarely. Now, I cannot run a diagnostic test on the computer without it crashing. There is no blue screen, and i need to restart the computer. The diagnostic tests always end up crashing as well. Every once in a while when I try to start the computer the light will turn on but nothing will start up, and the computer makes a beeping noise. I looked up the beep code and it says this is due to a motherboard issue? It is one beep repeatedly. This beeping happens once in a couple restarts. Thanks in advance!