From my research, you probably have an ASUS motherboard. Which means, 1 long-2 short beeps means a Video Adapter Error. Either video adapter is bad or is not seated properly. Also, check to ensure the monitor cable is connected properly. If everything is connected properly and it still isn't working, this may mean that you will have to purchase a new video card. Not too expensive to replace really depending on what kind of graphics you are looking for. Check out www.newegg.com or www.tigerdirect.com or www.zipzoomfly.com These online stores will likely have what you are looking for.
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