Chosen Solution

Hi I have a Lenovo Think Pad T410. When I connect the laptop to an external monitor through a VGA cable,when you open a gray picture or a software with gray background,you will notice a huge noise on the screen,there are many websites that suggesting,this is all about ground loop,and you must cut the ground wire somehow,but the monitor power cable doesn’t have any ground connection at all,and the charger ground pin,is not connect to the outlet. So what is the problem exactly? What is the solution?

Dear hbirjand. They was talking about the ground wire which comes in VGA cable. try to do below steps and faults may solve,

  1. Clean the VGA connectors and try to stable connection, as well as check whether broken or bent pins were in the male VGA connector.
  2. Change the second monitor’s Restoration to minimum level and try
  3. Change the VGA cable and try

There are 3 cause of this issue: 1- Group loop on your connector 2- VGA cable or VGA output port issue 3- VGA chipset issue But the highest posibble option usually is frist To fix this issue 1 - Follow this article to break the ground loop on your monitor and laptop connectors https://mrgnome.wordpress.com/2009/06/12… 2- TESTED ON UBUNTU: If the above solution cant help, try to install TLP and reboot your ubuntu, the noise will be gone. To install TLP, follow this article http://linrunner.de/en/tlp/docs/tlp-linu… Good luck

Turn off the wireless network adaptor. That worked for me.