If you're unable to put your computer to sleep (aka standby), or it wakes up a few minutes after being put to sleep, a hardware device could be causing the issue. You can use the following steps to see which devices might be keeping the computer from sleeping.

1. Open Command Prompt (Type cmd in the search bar).
2. Type "powercfg -devicequery wake_armed" into the window and press Enter.
3. A list of devices that have the ability to wake the computer will be displayed.

The devices that are displayed are allowed to wakeup the computer when needed or called upon. To disable a device's ability to wake the computer you have to go into Device Manager and change the settings.

Make sure that you experiment with the devices that are listed to figure out which one is causing the computer to not sleep. The easiest way to do that is to unplug one device at a time and then try to put the computer to sleep. Once you find out which device is causing the issue you can follow the steps below.

1. Open the Start menu
2. Right Click on Computer.
3. Choose the Manage option.
4. Click on Device Manager.
5. Find the device that is causing the issue and Right Click on it.
6. Choose Properties.
7. Click on the Power Management tab.
8. Uncheck the box that says "Allow this device to wake the computer".
9. Click OK to save the changes.

Not all of the devices need to be disabled, just the one causing the problem. Usually it's a network card, but it depends on the hardware installed.

Keep in mind that if you disable the option for mice or keyboards you will not be able to press a keyboard/mouse button to get your computer to wake up. In order to wake the computer you will have to use the power button.

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