power cord and power cuts

Hello.  I have a Pavilion dv7-3171nr, Windows 7.  It's a laptop.  In the last few days, I noticed some strange things that I've finally pinned down for my power cord.  I've been hear a sound like a bug zapper.  Not as loud, very weak, that's why it took me so long to locate where the devil noise came from.  When I hear the noise, it caused small power outages in the lamp which is located in the room in which I work.  Then, of course, at first I think it is the lamp, or the light bulb, our electric system... Anyway yesterday I finally put the finger on it at the exit of that my power cord is plugged.  When I unplugged it, all of these symptoms have disappeared.  At that moment, I realized that it was plugged in all the other times also in all other rooms, I was in when all this was going on.  Everyone knows about this problem with a power cord?  I had a lot of laptops over the years and this is a first for me!

Good decision.

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