How to fix a computer that turns on but no display

You power on your computer and wait for it to boot up. Several minutes go by, but the screen stays dark. A soft humming from the hard drive tells you the computer is on, but no display appears.

Asurion Experts keep your devices running smoothly. Whether you need help with monitor settings or have received a monitor error message, count on us for a simple explanation (and fix!). Here's what to do if your computer turns on but no display appears on the monitor.

Ways to troubleshoot a computer that turns on but the screen is black

Display issues with a computer monitor can stem from faulty cables, a loose connection, and hardware or software conflicts. Solving the problem can be as easy as one of these fixes.

1. Check if the monitor is powered on and connected

Loose connections can prevent the monitor from receiving the electricity it needs to turn on. Verify the monitor's power cable is securely seated in a wall outlet or another power source. Confirm the power cord is firmly attached to the monitor.

Also, check the connection of the display cable that runs from the computer case to the monitor. It should be securely fastened into its ports. If the computer has an alternative video output port, try connecting the cable to it.

2. Inspect the video cable and connections

Closely examine the video cable for damage. Look for bent pins or holes in its plastic covering. If you notice damage, replace the cable with another one that's compatible with your computer.

Most monitors have multiple video input sources (similar to TVs). Locate the physical button on the monitor to access its input settings, then verify the input source is your PC's video port.

3. Disconnect all external accessories

Detach any accessories from your computer, such as USB drives, docking stations, or external storage devices. Turn off your computer and restart it with only the keyboard, mouse, and monitor connected. Sometimes, external accessories can cause problems during the start process and affect normal display functions.

4. Start the computer in Safe Mode

Booting your computer in Safe Mode can help you diagnose software problems that interfere with display capabilities. If your monitor works in Safe Mode, then the display issue isn't caused by a bad device driver or default setting.

• Click Start > Settings.
• Click Update & Security > Recovery > Advanced Startup.
• Click Restart Now.
• Wait for the computer to restart. In the Choose an Option menu, click Troubleshoot > Advanced Options.
• Click Startup Settings > Restart.
• Press the F4 or 4 key to boot the computer in Safe Mode.

Check for hardware issues if the screen is still black

If you continue to experience problems with a monitor that won't turn on, there are a few advanced fixes you can try.

1. Reset BIOS or UEFI settings

• Restart your computer.
• Press the F2 key repeatedly to enter the BIOS or UEFI setup.
• Look for an option to load the BIOS or UEFI default settings. On some devices, pressing the F9 key will restore BIOS defaults.
• Press the Esc key. Select Save and exit.
• Press the Enter key to save changes.
• Wait for the computer to restart.

PC manufacturers may use other key sequences to restore default BIOS settings. Check your device's user manual for exact instructions.

2. Replace the CMOS battery

The CMOS battery stores a computer's BIOS settings and hardware configurations. It resembles a small silver coin and is usually inserted into the computer's motherboard. If you have an older PC, you may need to replace the CMOS battery. One common sign of a failing CMOS battery is incorrect time and date on your desktop. If you frequently need to reset it, the CMOS battery may be to blame.

3. Reset the GPU settings

Incorrect settings on your PC's graphics processing unit (GPU) can cause display issues. Restore the GPU to its default settings using a simple keyboard shortcut.

• Press and hold the Windows, Shift, Ctrl, and B keys.
• Wait for your PC to emit a beep before releasing the keys.

4. Listen for beep codes or LED indicators on startup

If the BIOS is faulty, a computer will emit beeping sounds during startup. The beeping noises help identify the root cause of the problem. If you hear beeps during the startup process, note their sequence. Then, check the computer's user manual to clarify what the beeps mean. Most manufacturers include a list of beeps and their meaning in the user guide.