Monitor issues with Windows 10 usually come down to four causes: a loose or wrong cable, the wrong input or display mode, an outdated or corrupted graphics driver, or a resolution and refresh-rate mismatch. Work through the seven fixes below in order. Most people solve a black screen, a flickering display or a second monitor that is not detected within the first three steps, without reinstalling anything.
Before you start, note exactly what you see: no signal, flickering, blurry or stretched picture, wrong colours or second monitor not detected. The table tells you which fix to try first.
| Symptom | Most likely cause | Start with |
|---|---|---|
| “No signal” or black screen | Cable, input source or driver crash | Fix 1, then Fix 3 |
| Second monitor not detected | Projection mode or detection | Fix 2 |
| Screen flickers or flashes | Graphics driver or an incompatible app | Fix 3 and Fix 7 |
| Blurry, stretched or wrong size | Resolution or scaling | Fix 4 |
| Tearing, stutter, 60 Hz on a 144 Hz monitor | Refresh rate or cable bandwidth | Fix 5 |
| Problem started after an update | New driver or Windows update | Fix 3 (roll back) and Fix 6 |
Fix 1: Check the cable, port and input source
A surprising number of display problems are physical. Turn the monitor off, unplug the video cable at both ends and reconnect it firmly. Then:
- Use the monitor’s own buttons to select the correct input (HDMI 1, HDMI 2, DisplayPort, USB-C). Many monitors do not switch automatically.
- If your PC has a graphics card, plug the monitor into the card’s ports, not the motherboard ports next to the USB sockets.
- Try a different cable. For 1440p at 144 Hz or 4K you need HDMI 2.0 or newer, or DisplayPort 1.2 or newer. Cheap adapters (HDMI to VGA, USB-C hubs) often limit resolution or refresh rate.
- Test the monitor on another device, or another monitor on your PC. That tells you in two minutes whether the problem is the screen or Windows.
Fix 2: Detect the display and set the projection mode
When Windows 10 does not show anything on a second monitor, it is often set to show the desktop on one screen only.
- Press Windows + P and choose Extend (or Duplicate to mirror the main screen).
- Open Settings › System › Display, scroll to Multiple displays and click Detect.
- Click Identify to see which number belongs to which screen, then drag the boxes so they match the physical layout of your desk.
- For a wireless display, use Connect to a wireless display in the same section.
Fix 3: Restart, update, roll back or reinstall the graphics driver
The graphics driver is the most common software cause of monitor problems in Windows 10: black screens, flicker, low resolution and missing displays. Try these in order.
- Restart the driver: press Windows + Ctrl + Shift + B. The screen goes black for a second and the driver reloads. If the picture comes back, the driver had crashed.
- Update it: right-click Start, open Device Manager, expand Display adapters, right-click your graphics card and choose Update driver. For the newest version, download the driver directly from NVIDIA, AMD or Intel.
- Roll it back: if the problem began after an update, open the adapter’s Properties › Driver tab and click Roll Back Driver.
- Reinstall it cleanly: choose Uninstall device, tick the option to remove the driver software, restart, and let Windows or the manufacturer’s installer add a fresh copy.
If Device Manager lists only Microsoft Basic Display Adapter, no proper driver is installed. That alone explains low resolution, no multi-monitor support and a refresh rate stuck at 60 Hz.
Fix 4: Set the native resolution and the right scaling
A blurry, stretched or oversized picture almost always means the resolution does not match the panel.
- Open Settings › System › Display and set Display resolution to the option marked (Recommended). That is the native resolution of the panel.
- Under Scale and layout, use 100% for a 24-inch 1080p screen, 125–150% for 1440p and 150–175% for 4K, so text stays readable without blurring.
- If some apps still look fuzzy, open Advanced scaling settings and turn on Let Windows try to fix apps so they’re not blurry.
Fix 5: Choose the correct refresh rate
A 144 Hz gaming monitor often runs at 60 Hz until you change it, and a refresh rate the cable cannot carry causes flicker or “out of range” errors.
- Go to Settings › System › Display › Advanced display settings.
- Select the monitor at the top, then pick the highest rate under Refresh rate.
- If the highest rate is missing, the cable or port is the bottleneck (see Fix 1), or the driver is the basic Microsoft one (see Fix 3).
Fix 6: Install pending Windows and driver updates, then turn off fast startup
Open Settings › Update & Security › Windows Update, install everything, then click View optional updates and check Driver updates for a display or chipset driver. Restart afterwards.
If the monitor shows “no signal” only after a shutdown but works after a restart, fast startup is a common culprit. Open Control Panel › Power Options › Choose what the power buttons do, click Change settings that are currently unavailable, untick Turn on fast startup and save.
Fix 7: Find the app or setting that causes flicker
Microsoft’s own test for screen flicker is simple: press Ctrl + Shift + Esc to open Task Manager and watch it.
- If Task Manager flickers along with everything else, the cause is the display driver: go back to Fix 3.
- If Task Manager does not flicker, an app is the cause. Antivirus suites, screen recorders, RGB lighting tools and old overlay software are common offenders. Update or uninstall recently added apps one at a time.
- Turn off Night light and HDR (Settings › System › Display) to rule them out, and run dccw from the Start menu to recalibrate colours if they look washed out.
Still not working? Signs the problem is hardware
- The monitor shows the same fault on a second computer, or its own on-screen menu flickers or has lines.
- Vertical or horizontal lines that stay in the same place, dead pixels, or a backlight that fades out.
- Artifacts (coloured blocks or sparkles) even in the BIOS screen, which points to a failing graphics card rather than Windows.
In those cases a driver or setting will not help; check the warranty of the monitor or graphics card.
Windows 10 is out of support: when an upgrade fixes more than the monitor
Microsoft ended standard support for Windows 10 on 14 October 2025. Graphics vendors now focus new drivers and fixes on Windows 11, so display problems on new monitors, high refresh rates, HDR and multi-monitor setups are increasingly solved only there. If your PC meets the requirements, upgrading also brings better multi-monitor handling: Windows 11 remembers window positions per monitor and restores them when you reconnect a screen.
Read what Windows 10 end of support means for you, check the Windows 11 requirements, and follow our guide to upgrading Windows 10 to Windows 11. If you need a license, a Windows 11 Pro product key or Windows 11 Home product key activates the new version for the life of the PC.
Frequently asked questions
Why does my monitor say “no signal” on Windows 10?
Usually the monitor is on the wrong input, the cable is loose or plugged into the motherboard instead of the graphics card, or the graphics driver has crashed. Check the input and cable first, then press Windows + Ctrl + Shift + B to restart the driver.
Why is my second monitor not detected in Windows 10?
Press Windows + P and choose Extend, then use Settings › System › Display › Detect. If it is still missing, try another cable or port and update the graphics driver.
How do I fix screen flickering in Windows 10?
Open Task Manager. If it flickers too, update or roll back the display driver. If it does not, uninstall recently added apps one at a time until the flicker stops.
Why is my screen blurry after connecting a monitor?
The resolution is not set to the monitor’s native value. Choose the resolution marked (Recommended) in Settings › System › Display and adjust scaling.
How do I change my monitor to 144 Hz on Windows 10?
Open Settings › System › Display › Advanced display settings, select the monitor and choose 144 Hz under Refresh rate. Use DisplayPort or HDMI 2.0+ and the latest graphics driver.
Will upgrading to Windows 11 fix my monitor problems?
It fixes problems caused by old drivers and missing updates, because new drivers and fixes now target Windows 11. It will not fix a faulty cable, monitor or graphics card.
