Repeating keys

I came here looking to see if anyone else has run into this problem. Many are similar, but are not the same. Situation: Attempting to install a Linux system on a tower. When the system boots the DVD, it asked for me to select what I wish to do. Most of the time, clicking the down arrow has...

I give up and need help. I have an unstable g910 orion spark. Started repeating inputs of A key then spread a little bit to other keys. Then i somehow fixed it by blowing the dust in it with a compressor. At that time i thought that was the reason for multiple inputs. But after a few months it...