SAPman

My screen goes black after I logon to Windows 7 or the screen appears for a short time then goes black. Rebooting sometimes helps, turning monitor off and back on sometimes helps for a little while or if I leave the monitor on and walk away it goes black. Already checked power settings and it is not hibernating. This cames out of no where. There were no software installs or updates, it just started. Ran Glary Utilities, Wise Care, Malwarebytes Anti-Malware, Spybot, Super Anti-Spyware and Microsoft security essentials. Please help Operating system:Windows 7 Home Premium (64 bit) Service Pack 1 System root: C:Windows Available physical memory: 3839 MB CPU: AMD Phenom II X2 521 Processor Drive Info: C: 920.18 GB D: 11.23 GB Internet Explorer: 11.0