My laptop gets hot and colors appear then slowly goes white?

A while ago my laptop turned green then checkers of other colors appeared, the colors then slowly changed to white. I turned it off and wanted to see what happened. The laptop became really hot and did not let me on the internet, i would open it and it would close it. I did a scan and it said i had a trojan, it said it removed it but every time i scan again...it is there.