I built a brand new computer about a month ago. Every time I leave it on for more than three hours, without anyone touching it, it goes into a black screen and a flashing white line in the upper left corner. This is bothering me since I download video which takes about 6 hours to download, all the data is lost if I leave the computer alone.
I am using Windows 7 Ultimate, these are my specs(Drivers are updated):
The PSU is as old as the computer, about a month old. The case I'm using is a Silverstone Precision Black, with one fan in the front, blowing into the case, and another one at the back blowing outwards.