I was installing Windows 10 on an old Sony Vaio PCG-61111M laptop and the installation went smoothly. I left it unconnected to the internet for awhile and did some other things. When I came back it was still turned on and I connected to the wifi and made sure I could connect to the internet via a web browser and also checked that the Windows license was activated.
I then walked away from my desk again and got on with other some other things. When I came back the screen was black and the laptop didn't respond with movement of the mouse of tapping keys on the keyboard. I switched it back on via the on/off button and it booted back into Windows. I checked the sleep settings but there weren't any. This surprised me a bit. The only setting was the screen turning off after a period of 10 minutes inactivity.
Then a few minutes later the laptop just turned itself off! Now I was getting a bit worried. What was going on. I turned it back on and it booted up fine into Windows but then after a few minutes it switched itself off. A Google search into the problem indicated that the graphics driver needed uninstalling and reinstalling. I did this although I was a bit sceptical because the only driver was a Basic Microsoft Driver. If this was the cause then there was no hope.
I then had a brain wave. When the laptop wasn't connected to the internet it seemed to be fine. As the computer wasn't able to go to sleep I remembered that wifi adapters have a Power saving setting. I turned this off and the problem was instantly fixed.
How to turn off power saving setting on wifi adapter
- Open the Windows Control Panel.
- Change View by: to Small icons.
- Click Device Manager.
- Expand Network Adapters.
- Right mouse click the wifi adapter and select Properties.
- Select the Power Management tab.
- Uncheck Allow the computer to turn off this device to save power.