I havent met a problem like this before, but:
Try to attach a monitor to your laptop (if you can). And then you will see if the problem is still there in the output monitor, then something wrong with your laptop, if its ok, then your LCD has some troubles. You wrote its not because of the color temperatures. Maybe you should download some refreshments for your videaocard, but if I were you and if I wouldnt like to thinking about all this problem, I would give the laptop back to the Toshiba guy, and ask for another same type, for my money. If the guy couldnt help you, he must change your laptop to another one.
Then try to install PS again, and you will see if the problem is still there with the new laptop, then somethings wrong with that type of laptop. But I think after you get the new notebook this all problem will disappear.