This PC beep code indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information. Please consult this website for further information regarding this issue (1 long, 2 short beep code) as it has plenty of useful advice as to how you can remedy this problem.
Beep codes vary but 1 long and 2 short usually indicate a video problem. Since your problem began with removing the ram try this. Remove the memory modules again and re-seat firmly. If you notice the memory channels are dusty blow them out before re-seating. Hope this solves your problem.
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