If you mean "no display" at boot time but then other times it works, that is one thing but if you are losing the display from within Windows and you know it's not the sleep settings (You know...monitor going to sleep) you should start with chipset drivers from you motherboard manufacturer''s page. Install that. Reboot. Then Google "AMD Adrenaline driver" and install the latest stable WHQL version. Reboot. If it still does it, apply the rest of the drivers from the motherboard website....audio...LAN ..etc..and also consider disabling 'Hybrid Sleep' from within Windows and turn off 'Fast Startup' from within Windows. They cause problems like this.