Manual for ROG G20AJ

Manual for ROG G20AJ

Brand: ASUS

Category: Desktop PC

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: April 20, 2026, 7:41 p.m.

Manual Publish Date: 2014-04-01

Warranty Information

Refer to the warranty card for specific warranty details for your product.

Welcome to your new ASUS Desktop PC! This guide will help you set up and start using your computer. Getting Started:
  • Unpack your computer and verify all package contents.
  • Connect the monitor, keyboard, and mouse.
  • Plug in the power cord and turn on your computer.
Connecting Devices:
  • Learn how to connect USB storage devices, microphones, speakers, and multiple displays.
Using Your Computer:
  • Understand proper posture for comfortable use.
  • Learn how to use the optical drive.
Connecting to the Internet:
  • Set up both wired (Ethernet) and wireless (Wi-Fi) connections.
Troubleshooting:
  • Find solutions for common problems like power issues, display problems, and connectivity issues.
Windows 8.1 User Manual:
  • Familiarize yourself with the Windows 8.1 interface, apps, and basic operations.

Troubleshooting and error codes

Problem Possible Cause Action
My computer cannot be powered on and the power LED on the front panel does not light up.
  • Check if your computer is properly connected.
  • Check if the wall outlet is functioning.
  • Check if the Power Supply Unit is switched on. Refer to the section Turning your computer ON in Chapter 1.
My computer hangs. Do the following to close the programs that are not responding:
1. Simultaneously press <Alt> + <Ctrl> + <Delete> keys on the keyboard, then click Task Manager.
2. Do the following based on the operating system:
  • On Windows 7: a) Click Applications tab. b) Select the program that is not responding, then click End Task.
  • On Windows 8.1: Under Task Manager in the Processes tab, select the program that is not responding, then click End Task.
If the keyboard is not responding, press and hold the Power button on the top of your chassis until the computer shuts down. Then press the Power button to turn it on.
I cannot connect to a wireless network using the ASUS WLAN Card (on selected models only)?
  • Ensure that you enter the correct network security key for the wireless network you want to connect to.
  • Connect the external antennas (optional) to the antenna connectors on the ASUS WLAN Card and place the antennas on the top of your computer chassis for the best wireless performance.
The arrow keys on the number key pad are not working. Check if the Number Lock LED is off. When the Number Lock LED is on, the keys on the number key pad are used to input numbers only. Press the Number Lock key to turn the LED off if you want to use the arrow keys on the number key pad.
No display on the monitor.
  • Check if the monitor is powered on.
  • Ensure that your monitor is properly connected to the video output port on your computer.
  • If your computer comes with a discrete graphics card, ensure that you connect your monitor to a video output port on the discrete graphics card.
  • Check if any of the pins on the monitor video connector is bent. If you discover bent pins, replace the monitor video connector cable.
  • Check if your monitor is plugged to a power source properly.
  • Refer to the documentation that came with your monitor for more troubleshooting information.
When using multiple monitors, only one monitor has display.
  • Ensure that the both monitors are powered on.
  • During POST, only the monitor connected to the VGA port has display. The dual display function works only under Windows.
  • When a graphics card is installed on your computer, ensure that you connect the monitors to the output port on the graphics card.
  • Check if the multiple displays settings are correct.
My computer cannot detect my USB storage device. The first time you connect your USB storage device to your computer, Windows automatically installs a driver for it. Wait for a while and go to My Computer to check if the USB storage device is detected.
Connect your USB storage device to another computer to test if the USB storage device is broken or malfunctions.
I want to restore or undo changes to my computer's system settings without affecting my personal files or data.
  • On Windows 7: The Windows System Restore feature allows you to restore or undo changes to your computer's system settings without affecting your personal data such as documents or photos. For more details, refer to the section Restoring your system in Chapter 2.
  • On Windows 8.1: You can use Windows 8.1 Refresh everything without affecting your files recovery option to restore or undo changes to your computer's system settings without affecting your personal data such as documents or photos. To use this recovery option, click Settings > PC Settings > Update and recovery > Recovery from the Charms bar, select Refresh everything without affecting your files, and click Get Started.
The picture on the HDTV is distorted. It is caused by the different resolutions of your monitor and your HDTV. Adjust the screen resolution to fit your HDTV. To change the screen resolution:
  • On Windows 7: 1. Do any of the following to open the Screen Resolution setting screen: Click > Control Panel > Appearance and Personalization > Display > Change display settings. Right click anywhere on your Windows desktop. When the pop-up menu appears, click Personalize > Display > Change display settings. 2. Adjust the resolution. Refer to the documentation came with your HDTV for the resolution. 3. Click Apply or OK. Then click Keep Changes on the confirmation message.
  • On Windows 8.1: Do any of the following to open the Screen Resolution setting screen:
    • From the Start screen a) Launch the All Apps screen and pin Control Panel on the Start screen. For details, refer to Pinning an app on the Start screen from the section Working with Windows apps. b) From the Control Panel, click Adjust screen resolution under Appearance and Personalization.
    • From the Desktop Mode screen a) Launch the Desktop Mode from the Start screen. b) Right click anywhere on your Desktop Mode screen. When the pop-up menu appears, click Personalize > Display > Change display settings.
My speakers produce no sound.
  • Ensure that you connect your speakers to the Line out port (lime) on the front panel or the rear panel.
  • Check if your speak is connected to an electrical source and turned on.
  • Adjust your speakers' volume.
  • Ensure that your computer's system sounds are not Muted. If it is muted, the volume icon is displayed as . To enable the system sounds, click from the Windows notification area, then click . If it is not muted, click and drag the slider to adjust the volume.
  • Connect your speakers to another computer to test if the speakers arer working properly.
The DVD drive cannot read a disc.
  • Check if the disc is placed with the label side facing up.
  • Check if the disc is centered in the tray, especially for the discs with non-standard size or shape.
  • Check if the disc is scratched or damaged.
The DVD drive eject button is not responding.
  1. On Windows 7, click > Computer. On Windows 8.1, hover your mouse pointer over the lower left corner of Windows® desktop then right-click on the Start Screen's thumbnail. From the popup menu, click File Explorer to open the Computer screen.
  2. Right-click , then click Eject from the menu.
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