The 30-Second Fix: Reseat the Cable and Check the Connection
What's actually happening here is most black-screen issues are a bad physical connection, not a driver problem. The monitor goes dark because it stops receiving a signal, and the most common reason is a loose or partially seated cable.
Do this first: unplug both ends of the video cable (HDMI, DisplayPort, DVI, whatever you're using) and plug them back in firmly. You want to hear the click on HDMI and feel the latch seat on DisplayPort. If your DisplayPort cable has a release button, press it before pulling — yanking it out can bend the connector pins.
While you're at it, check the monitor's own input selection. If you have multiple inputs (HDMI 1, HDMI 2, DisplayPort), the monitor might be flipping to an empty one. Use the monitor's OSD (on-screen display) buttons to manually pick the port your PC is plugged into.
This solves maybe 40% of cases. If your screen still flickers or goes black after a few minutes, move on.
The 5-Minute Fix: Swap Ports and Test the Cable Itself
If reseating didn't hold, start swapping. The point here is to isolate whether the problem follows the cable, the port, or the GPU output.
First, try a different cable. I keep a spare HDMI around for exactly this. If you're on DisplayPort and you're using a cheap cable, that's a prime suspect — DP is stricter about signal integrity than HDMI, and a marginal cable will drop the link randomly, especially at high refresh rates or resolutions.
Test this way: plug the cable into a different port on your GPU. If you have two HDMI ports, use the other one. If you have a motherboard with integrated graphics and your CPU supports it, plug the monitor into the motherboard's HDMI/DP port temporarily — that bypasses the GPU entirely and tells you if the GPU output is the problem.
Here's the part people skip: also test the monitor's other input ports. A flaky HDMI port on the monitor is just as common as a bad GPU port. Plug the same cable into the monitor's other HDMI or DP slot.
If swapping ports on the monitor fixes it, you've found a dead input. If swapping the cable fixes it, you've found a dead cable. Either way, you're done here.
The 15+ Minute Fix: Driver and Power Management Settings
Now we're in the territory where the hardware is fine but the software is dropping the signal. This usually shows up as: the monitor goes black for 2-3 seconds then comes back, or it won't wake from sleep, or it only happens during games.
Update or Roll Back the GPU Driver
The classic culprit is a broken graphics driver. Both NVIDIA and AMD have shipped versions that caused random black screens over the years. The fix is either updating to the latest stable driver or rolling back to the last one that worked for you.
For NVIDIA: download the latest driver from nvidia.com, but use the "Custom installation" and check "Perform a clean installation." That wipes out old settings that might be causing the handshake to fail.
For AMD: same deal with amd.com, and use the factory reset option in the installer. If the problem started after a recent update, go back to the previous version — a newer driver isn't always better.
Turn Off the GPU's Aggressive Power Saving
Here's the less obvious one. Both NVIDIA and AMD let the GPU drop its power state when idle, and some cards are too aggressive about it. When the GPU re-initializes the display output, the monitor can lose sync and go black.
In NVIDIA Control Panel, go to Manage 3D Settings, then Power Management Mode, and set it to "Prefer Maximum Performance." This keeps the GPU from downclocking as much. It uses more power, but it's a solid test.
For AMD, go to Radeon Software, Settings, then Graphics, and set Power Saving to Off.
If the black screens stop, you've found the root cause. You can try to dial power saving back later, but honestly, the power difference is small.
Disable Link State Power Management in Windows
Windows has a hidden power setting that can cut power to the PCIe link. When it does, the GPU's output can glitch. This is worth checking even if you're on a desktop.
Control Panel → Power Options → Change plan settings → Change advanced power settings → PCI Express → Link State Power Management → Set to OffSet it to Off for both "On battery" and "Plugged in." This prevents Windows from dropping the link to the GPU.
The DisplayPort Handshake Problem
If you're on DisplayPort, there's a known quirk with multi-monitor setups and monitor power saving. Some monitors send a "sleep" signal that the GPU misinterprets, and the link never comes back.
The workaround: turn off the monitor's eco mode or Auto Power Save in its OSD. Look for something called "DP Deep Sleep" or "Standby Mode" — disable it. This keeps the monitor's receiver active, so the handshake doesn't break.
If you have a second monitor, also try swapping which one is primary. That's a weird one, but it works because the GPU sometimes prioritizes one output over another and gets confused.
When to Stop and Call It
If you've done all of the above and the monitor still drops signal, it's almost certainly the monitor's internal power supply or the GPU's output hardware. At that point, don't keep troubleshooting — try the monitor on another PC (if you have one) to confirm, then contact the manufacturer. A dying monitor will keep looking like a software problem until it finally gives up.
One last thing: if your monitor has a firmware update available, install it. Monitors ship with bugs too, and firmware updates fix exactly this kind of signal-loss issue.