I recently upgraded my Dell Inspiron 660 with an EVGA 760 video card and a 500 watt EVGA PSU. Now, whenever I put it to sleep, it shuts off. I checked under power options, and it says it should be sleeping, but not. Any idea what caused this? My other systems specs are an i5-3330, 8 GB RAM, 2TB Seagate HDD.
I have Acer - Aspire E1-572 and ran into this issue after Windows 8.1 upgrade. After updating the Wireless LAN_Atheros_10.0.0.263_W81x64_A driver (make sure to download for Windows 8.1) the issue went away.