Computer after one hour will not shut down have to pull power plug?

It sounds like you tried to shut it off other ways, but if you haven't, first try the power switch. After that if it doesn't work, press the power button on the computer. If it doesn't turn off, hold it for 10 seconds. If it still doesn't turn off, and you only pulled the cord out once, try it again. And if that doesn't work, take it to a computer specialist to have it examined.