I installed 30 days trail new Photoshop and it doesn't show any white. even when i open an image with white in it, it shows it as yellow. I choose #ffffff and its yellow, when i save it as an image and see the image its white. when i open it with Photoshop its yellow, could you help me?
If you don't know what display calibration is, and you're using Windows, then you want to a) associate the Windows default sRGB IEC61966-2.1 profile with your monitor (this is done in the operating system, not Photoshop), then b) go learn all about color-management, so you'll understand why calibrating and profiling your monitor is needed so the colors you create while editing are as accurate as you can make them.
Your display driver may be insufficient for Photoshop's use, then. Photoshop CS6 tries to do color-management in the GPU if it can, and it's possible your display driver isn't properly facilitating that.
Assuming you have a PC, try visiting the web site of the maker of your video card and downloading their latest display driver for your hardware and OS.
You can also try going into the Preferences - Performance dialog and disabling the Use Graphics Processor setting, then quit and restart Photoshop. If that corrects the problem it pretty much says your display profile is confusing the color-management logic.
What make/model of video card/chip do you have?
What is the version number and date of your installed video driver?
Is that the latest one for your card/chip from the mfgr's. Web site?