Hi, I recently built my own computer and have been having a repeating problem. Occasionally (not all the time) when I boot my computer everything seems normal until just before the windows log in there is a flash and the screen goes black. I have taken the computer apart and put it back together but the problem remains. Is it a problem with software, hardware or even the monitor? I have tried as much as I can and haven't found any online information about this specific problem. If you have any suggestions or need more information on specs please reply, thanks.