If you are hearing a pattern with two beeps (it may repeat and seem like four beeps), there is a compatibility issue with the video card that you have added. If you are hearing a pattern with three beeps, then there is an issue with the memory you have installed.
Please provide us with more information (actual part numbers, NOT descriptions) regarding (a) the processor you are using, (b) the memory you are using and (c) the video card you are using.
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