Dell S2240L Monitor - Manual (Page 36)

If VGA or HDMI cable is not connected, a floating dialog box as shown below appears. The monitor will enter Power Save Mode in 5 minutes if left at this state.
or
See Troubleshooting for more information.
Setting the Maximum Resolution
To set the Maximum resolution for the monitor:
Windows XP:
1. Right-click on the desktop and select Properties.
2. Select the Settings tab.
3. Set the screen resolution to 1920 x 1080.
4. Click OK.
Windows Vista® ,Windows® 7 ,Windows® 8:
1. For Windows® 8 only, select the Desktop tile to switch to classic desktop.
2. Right-click on the desktop and click Screen Resolution.
3. Click the Dropdown list of the Screen resolution and select 1920 x 1080.
4. Click OK.
If you do not see 1920 x 1080 as an option, you may need to update your graphics driver. Depending on your computer, complete one of the following procedures.
If you have a Dell desktop or portable computer:
Go to support.dell.com , enter your service tag, and download the latest driver for your graphics card.
If you are using a non-Dell computer (portable or desktop):
Go to the support site for your computer and download the latest graphic drivers.
Go to your graphics card website and download the latest graphic drivers.