I always hear this pippling noise whenever I start the SE up or shut it down. Is that normal?

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Is that in addition to the standard beep, or instead of? It sounds a bit like the floppy disk drive. There's also some static, likely coming out of the speaker. If it's happening at the same time as what sounds like the floppy drive noise, then it is definitely electrical, a short, or a loose wire, if not a low voltage problem as trag suggested.