My computer stopped working and son said he smelled something burning. When I got home a few days later I took the computer apart. I dont see anything burned or bubbled. i really dont smell anyhting anymore. I have verified that its not the power supple. When I unhook the 4 pin cable for the power to the cpu the computer comes on. I get 1 of the 4 LED lights on the motherboard. All 4 are normally on. So do i have a bad board or cpu.