[sdiy] Hum Problem Kaput

[Moho Disco]

Well, this is for the benefit of anybody who
would like to know how my hum problem
got resolved...

I got my Echo Layla24 laptop adapter, and
the hum reduced by a good 60%.  And then
after that I plugged the laptop's power supply
into a two-prong adapter disconnecting the
ground plug, and bingo, all the rest of the
hum was gone.

So I have a question.  Does getting rid of
the ground plug expose me or my laptop
to any kind of electrical danger?  What
exactly does removal of the ground do?

Thanks,

Lava