How To Stand By Before My Laptop Overheats Toshiba Laptop Screen Issues.....?

Toshiba laptop screen issues.....? - how to stand by before my laptop overheats

I had my Toshiba Satellite laptop for almost 2 years, but in the last two months, strange things with the screen color. After leaving my laptop in a few hours or more, the color screens wak like a second desktop screen is fine, but suddenly the color of the entire screen is bright and sparkling in strange shapes and designs. Wait until the screen is switched off when the computer to see if it suits him is on, but it does nothing. When I click on my computer and switch it on, within seconds you will be back to normal in a few hours or more. Sometimes I leave my computer on more than one day without this happening, but can sometimes occur after an hour, even if your computerHE is cold and has been a while no more. My computer still has warranty, I'm sure, so I think they say about this topic, but I'm not sure if I explain that even for them. I do not think this is a matter of hours of overheating, because I had many laptops in the past and none have done this before. I will not let something like the carpets or anything that may block the fan. I can try to reinstall my operating system, because I'm not sure if I did that before you modified it. Who knows what could be the problem? or what can I do to solve this problem?