So i bought a alienware x51 r2 2 years ago and today i opened it up to give it a quick clean. I took out the optical drive and the graphics card. I had a cloth gave it a quick clean and put both back exactly how they were. I then closed the case plugged it back in and the computer turned on does 1 quick beep turns off. It then again turns on 1 quick beep turns off. This continues forever and i have no idea what i have done wrong. If you can fix this please tell me. Thanks in advance.