Hi,
I’ve had my B520 for about three weeks now and I had the same issues you are now describing. The worst issue was the video issue which would cause the PC to go grainy, the PC would freeze and I would have to do a hard reboot to restart it. I did some research on this site regarding the video and found the best solution was updated video drivers for the B520. These were not available from the Lenovo site but from a third part site that modifies newer video files that are available to work on various PC’s and laptops.
So here is what I did to correct the video issue. Follow this link to the video driver I upgraded to : http://forums.laptopvideo2go.com/topic/28991-v28579-windows-7vista-64bit-nvidia-oem-mobile/ You will need to download two files, the driver file and the inf modified file. Once downloaded, you will need to extract the driver file to a work folder, it will create a folder in your work area called 285.79_win7x64. Next copy the inf file you downloaded in the folder display.driver which is found under the main folder 285.79_win7x64. You will get the warning that the file already exists and you need to approve coping over it when prompted. At this point create a manual restore point via windows restore in case there are problems with the drivers you are about to install and you need to rollback afterwards. After that run the setup.exe found in the root of the folder 285.79_winx64 to install the upgraded video files. You will get several warning messaged about how these drives are from an unknown source, but go ahead and install them anyway. Once the setup completes, verify that Youtube and other video sites work correctly. Hopefully that corrects your video issue as it did for me. FYI – there is a newer version of the NVidia OEM Mobile drivers on this site, but they did not work correctly on the B520.
Next on the list is the volume issue. This may not be your issue, but I discovered that the B520 seems to have two separate volume controls. There is the windows volume slider which can be controlled via windows or via the Lenovo keyboard, then there are the volume controls on the touch screen. The volume controls on the touch screen seem to lay on top of the other volume controls. What I am saying is that if you are not obtaining satisfactory volume from the PC with the windows volume controls at max, try adjusting the touch screen volume control. You will notice that a different volume scale comes up when you use these and hopefully once adjusted your problem will be corrected.
My webcam light is always on as well. I never had a PC with a webcam before so I just thought that was normal, I guess not? I will be curious to see if someone post a comment about resolving that as well or if it’s just supposed to be that way.
When I first got this machine I was unhappy with the constant video issues and sound problem, but now my machine seems to be stable and I am pleased with the purchase for now. Good luck in getting yours stable.
