Re: I start the computer........then it shuts down automatically
While you have the case open check the seating of your connections from the power supply to motherbord. I had a similar problem once and found that the connector to the motherbord was not seated properly. I kept getting random shutdowns like the kind you experience. Once I seated the connector properly it never happened again.
Originally Posted by cariboo907
As mentioned heat is another likely cause. After cleaning out your case, especially the fans, power up with the cover off and check your fans to make sure they are working.
Multi-boot: Arch linux, Ubuntu 12.04, Windows 7 & Windows 8