Monitor keeps going black randomly? Here's the fix

30-second fix: Check the cable

Nine times out of ten, this happens because the monitor cable is loose or dying. I've seen it with HDMI, DisplayPort, even old VGA cables. Last month, a client's monitor went black every time they leaned back in their chair — the HDMI cable was barely hanging on.

First, unplug both ends of the cable and plug them back in firmly. Make sure you hear or feel a click, especially with DisplayPort cables (those little latches are easy to miss). Then jiggle the cable gently while watching the screen. If it flickers, swap the cable. Don't bother with the cheap Amazon Basics cable — spend $10 on a quality one from Monoprice or Cable Matters. That'll save you an hour of troubleshooting.

If you're using a DisplayPort cable, also check the lock. Some monitors have a locking mechanism that can break, causing the cable to sag. Push the cable all the way in and secure it with the latch.

Still happening? Move on to the next step.

5-minute fix: Disable power saving and update the GPU driver

Turn off the monitor's sleep timer

Some monitors have a built-in power saving feature that kicks in too aggressively. Look for a setting called "Power Saving," "Eco Mode," or "Deep Sleep" in the monitor's on-screen menu (OSD). Turn it off. This alone fixed the issue for a user I helped last week whose Dell monitor would go black for three seconds every 15 minutes.

Kill Windows power saving for the display

Windows can also make your monitor black briefly when it switches power states. Open Control Panel, go to Power Options, and set your plan to High Performance. Then click "Change plan settings" > "Change advanced power settings." Under "Display," set "Enable adaptive brightness" to Off and "Turn off display after" to Never. Also under "PCI Express," set "Link State Power Management" to Off. That last one is a common culprit on laptops and desktops with dedicated GPUs.

Update or roll back your GPU driver

A bad GPU driver is the next most common cause. Here's the thing — the latest driver isn't always the best. NVIDIA and AMD push out updates that sometimes break things. I had a client running an RTX 3060 that black-screened every time they opened Chrome — the driver was the problem.

Use DDU (Display Driver Uninstaller) to completely remove the current driver in Safe Mode, then install the driver from your GPU manufacturer's website — not Windows Update. If the latest driver gives you trouble, try the previous version. For NVIDIA, use Studio drivers instead of Game Ready if you don't game. They're more stable.

If you're on a laptop with Intel integrated graphics, update that too. Intel's drivers are finicky with multi-monitor setups.

15+ minute fix: Check the GPU, PSU, and monitor itself

If you've done the first two steps and the monitor still goes black, you've got a hardware issue. Time to get methodical.

Test with another monitor or TV

Borrow a monitor or connect your PC to a TV. If the issue goes away, your monitor is the problem. Could be a failing backlight, a bad capacitor on the power board, or a firmware bug. Check the manufacturer's website for a firmware update. For Samsung and LG monitors, there's often a USB-based update tool. For Dell, the firmware is usually embedded in the driver package.

If the issue follows the monitor, it's likely the PSU inside the monitor. Those are cheap to replace if you're handy with a screwdriver — search for your monitor model + "power board" on eBay. If not, get a new monitor. It's not worth paying a repair shop $100 to fix a $200 monitor.

Test the GPU and PSU

If the issue follows your PC, you need to rule out the GPU and the power supply.

First, reseat the GPU. Power down, unplug the power cable, open the case, remove the GPU, and put it back in firmly. Make sure the PCIe power cables are clicked in. I've seen loose 8-pin connectors cause intermittent black screens because the GPU can't draw enough power.

Next, test the PSU. A failing power supply can cause voltage drops that make the monitor lose signal. If you have a multimeter, check the 12V rail — it should be between 11.4V and 12.6V. If it's below 11.4V under load, the PSU is dying. Or just swap the PSU with a known good one if you have a spare. I keep a cheap 500W unit around just for this.

If you're on a laptop, the issue is likely the internal display cable or a dying GPU. Plug an external monitor in. If the external monitor works fine, the laptop's screen or its ribbon cable is toast. If the external monitor also blacks out, the GPU is failing — time for a new laptop.

One last thing — check the monitor's refresh rate

Some monitors, especially 144Hz or 240Hz ones, can black out if the GPU can't keep up. Drop the refresh rate to 60Hz in Windows display settings and see if the problem stops. If it does, your GPU or cable can't handle the bandwidth. Try a different cable first (DisplayPort 1.4 or HDMI 2.1), then consider a GPU upgrade if needed.

Bottom line: cable first, driver second, hardware third. You'll fix it in under 10 minutes 90% of the time. Don't overthink it.