I have an acer laptop when I turn on the computer the cpu fan goes on for a few second once it enters windows the fan will turn off or will turn on intermittently for a few seconds then shut off. So the computer will generally stay on until it gets to hot and then shuts down. Not sure what I can do to fix this problem not sure if there is a possibility the fan is bad but it seems to run nice and smooth when it turns on. It also has a basic bios and doesn't have any fan speed options or controls please help.