Q: hello, I have one Dell C640 laptop, which auto powers off and shuts down 2 seconds later after starting up. Without any display, without any prompt sound, there’s no any damaged thing, why is this happening? How to solve the problem? Hope to get your any suggestion and help, thank you!
1) Power failure or the laptop power failure, voltage has great undulation, which leads to ruleless auto shutdown or restart. Or the external power voltage is not stable, add one stabilized power.
2) Check up CMOS power management settings; CPU fan thermal ability is not enough, CPU temperature is too high, CPU and motherboard‘s auto protection function would auto shut down without any reason. As for concrete operation, please check our eBook <<03-Troubleshooting--Power>>