My Dell Desktop (Optiplex 780) is rebooting off and on, no rhyme or reason. Sometimes when I am on the internet and click on a new page or link, it instantly turns black, shuts down, and reboots. It does not get a blue screen, it instantly turns black.
I have Windows 7 home premium. I have all AVG 2012 internet security and keep it updated, as well as several Malware Programs, all updated. I have run Malwarebytes, SuperAntiSpyware, and AVG scans, finding nothing.
This computer is less than a year old. I have no idea what is happening.