Re: Sims 3 white lines
@Bts152 Have you taken steps to limit your in-game framerates? If fps is too high, it can cause the kinds of lines you're seeing, as well as a number of other inconvenient or even harmful effects. Aside from the game itself, it's better for the long-term health of your graphics card and the laptop overall if you cap framerates while playing.
To see your in-game fps, bring up the cheats console (ctrl-shift-C) and enter "fps on" without quotes. A number will appear in the upper right corner of your screen, and it should never go above the refresh rate of your screen, which is probably 60 Hz but may be higher. If framerates are consistently high or fluctuate wildly, they need to be manually limited.
Depending on how new your graphics driver is, you can probably set a framerate limit within the built-in Nvidia Control Panel. Right-click on the desktop, select the CP, then Manage 3D Settings, and you'll see this:
Turn on Max Frame Rate and set it to 60, click Okay, then Apply, and test in-game.