Why Laptop Freezes randomly on Turning On

I was working on some files suddenly laptop turns off I start again it turns of I start working again and it turns off again this time it gest to toshiba logo and freezes. And the logo gets distorted over time. I reset cmos battery it lets me enter bios I try to reinstall windows it freezes again. And now it only turns on after resetting cmos and then freezes after 10-25 sec . And I need to reset CMOS again inorder to start laptop please help