A few days ago I noticed that my power supply cable made a crackling noise when I plugged it into the pc. I didn't seem out of the ordinary back then. However, yesterday I tried to turn on the computer and nothing happened. I immediately checked the cable and saw it was still plugged in. It was not firmly fixed in its position (although it was fully plugged in) and I could still sightly move it upward and downward. I did so and the result was not only the mentioned crackling noise the cable made. Additionally the speakers made a much louder, continuous crack that stopped only after I left the cable alone. After moving it I could turn on the pc. The same thing happened to me today. The power supply (730W) and the computer as a whole (I7-4790K, GTX 980ti) are fairly new, bought less than a month ago. I use a socket with six slots, every one of them occupied. Can anyone tell me where the problem lies? I suspect the cable but the crackling speakers seem awkward. Thanks for helping me out, I really appreciate it.