It's been a while since I have got this issue.It's not like a screen tearing which is happening when zoom in or out the camera.It happens while playing the game.Suddenly the screen will black out and most of the time some lines are on the screen but the game is still working.I can hear the sound effects but after that all I can see is those lines.I'm really confused from this issue.I played TS3 for a long time without any issue at all but once I had remove a ram for a while and I add it later.Since I remove it this issue happened.Even now I added it the issue is still happening.I took a image from my phone.Can somebody please help me?Really need some help.

Thanks for trying to help me but unfortunately It keeps happening even I cleaned the both RAMS.But all this time I noticed one thing.It never happened on Create A Sim.Only while playing the game or building a lot.

Maybe also just check the power supply if you're on a PC - I think I remember having graphical issues like that when playing Sims 3 when mine was failing.

It could also be the graphic card as well if it not built in I had to replace my Graphic card in the pass after I got that problem.

Does it only happen when playing sim's 3 and no other games?
If so it's probably not your hardware.

usually when you have bad memory you will also get BSOD's (blue screen of death) These can happen randomly, even when you are just Idle in windows.
My experience with graphic's card and cpu failures nearly always result in BSOD's and the PC shutting down randomly or just turning off like you turned off the plug.

It could be that the game doesn't like your graphics card/chip, Are you using a dedicated graphic's card or on-board graphic's?
Does it only do it in the summer months? overheating maybe an issue? (mine tends to overheat a bit in the summertime, I should invest in some better cooling)

I won't suggest the usual (reinstalling the game ect... ect..) because most people already try it before asking for help.
But you could try moving/deleting the options file, I've had that cause me problems before & deleting it fixed it.
go to "Users\*****\Documents\Electronic Arts\The Sims 3" and move or delete "Options.ini" start the game, you will have to set your options up how you want them again, then close and restart the game.

That's all I can think of at the moment, hope it's of some help.

I wonder why it won't happen on CAS.

Actually I only played Sims.Before I install Windows 8 I had TS4 but nothing happens in it.(I had this issue even before I installed Windows 8) but when I launched TS4 while the game was loading I heard that welcome sound(which we can here when the game start) but it was still loading.Nothing other than that happened.This issue is only happened in TS3.
I'm using a dedicated graphic's card.I'm from Sri Lanka and In here there're no such seasons like summer or winter.Usually we have the same climate.
That issue happened today also and today a sky-blue screen appear.When this crash screen appear it would black out then appear then again black out and appear,it keeps happening like that.

Did u mean on-board video?I have already tried using it but when I try to play from it the game will crash as soon as it loads,It won't hold even for a minute after the game loads.

When in windowed mode, if you can play for a while, periodically go to Task Manager and see how much CPU and RAM is being used. I'm kinda curious.

The reason TS3 is toxic to computers is because it is so badly coded that there is nothing to stop it from trying to render at hundreds of frames per second (FPS), even though the game can only display 30 fps and the human eye can only see 30 fps. I use an FPS limiter to help with that and it is necessary for me to be able to safely play TS3.

EDIT: Since I feel like a door-to-door evangelist on every help thread preaching the gospel of the 3booter and FPS limiter, I have linked it in my signature. See the TS3 vs. Your CPU link. READ THE DIRECTIONS .

That's strange because my fps is around 60 fps and my game works fine like that.

@RoseCity You probably have more RAM than me and a 64-bit system. Or, you're just plain lucky, because TS3 is a drama queen.

That is so true - sometimes people have fantastic systems and even they are defeated by this crazy game. But I do have 16 gb of RAM.

I wish I could use FPS Limiter, but despite all attempts running my game through TS3W.exe still opens the game only through Origins and the Launcher and as soon as Origins opens the FPS Limiter shuts down. Sometimes I wish I didn't like this game so much, it would save a great deal of frustration.

I have an Nvidia card so I'll check those out.

I couldn't check these latest solutions I'll check them ASAP.Oh by the way I noticed one more thing.After going to the CAS in nraas mod it will hold the game for hours

Moving to Help.