Pavilion dv9500t ext. monitor rolling lines

Hi guys, thanks for reading and any suggestions/advice is greatly appreciated.

Let me start off by saying I've had this laptop since about Sept. 07. Everything has been working great, no lockups whatsoever. Games play fine and everything on my laptop screen looks fantastic. The issue I have is, whenever I connect an external monitor I get rolling transparent black lines BUT only when the power is plugged in. As soon as I unplug the power, the lines go away and everything looks clear.

I have chatted with HP support and they told me to do something with my battery that allowed a proper power discharge but it didn't work. I have currently tested this on 2 Monitors, a 22inch Viewsonic and a 20inch Dell monitor, both widescreen. I have also tested this with my VGA connection on the laptop and also using the QUICKDOCK VGA and using both connections i get the same result.

Funny thing is, I have connected my laptop VGA to my SAMSUNG 32inch TV LCD and no rolling lines! It seems to only happen to monitors.

Again any help is appreciated thanks!

 

nevermind i found the solution. it was the power strip i was connecting to. actually any power strip i connect to has to have the ground (the bottom long piece) removed from the end. as soon as I did that, the rolling lines went away. weird!!

 

That is what we electrical engineers call a "ground loop." Nothing weird, just something not commonly known.