Quick Answer: A monitor with the power light on but a completely black screen — no picture, no “No Signal” message, nothing — needs one test before anything else: press the monitor’s physical menu button. If the on-screen menu appears over the blackness, the monitor’s backlight and internal electronics are working fine and the fault is upstream (cable, input, or GPU); if the menu doesn’t appear, the fault is inside the monitor itself. A phone flashlight held close to the panel confirms a backlight failure specifically — a faint image underneath the flashlight beam means the panel is still displaying data, just not illuminating it.
A plain black screen is the most ambiguous monitor symptom there is, because it can mean almost anything from a one-second driver hiccup to a dead backlight. The two tests below take under a minute and point you straight at the right fix instead of guessing.
Black screen is not the same problem as “won’t turn on” or “No Signal”
- No power light at all is a power-supply problem — see our monitor not turning on guide for cable, outlet, and adapter checks.
- A “No Signal” message displayed on screen means the monitor is actively working and telling you so in words — see our monitor no signal guide for that specific, less-alarming case.
- A black screen with the power light on and no message of any kind — the case this guide covers — means either the source device crashed too hard to even send the normal no-signal handshake, or the monitor’s own backlight or internal electronics have failed. Those two causes need different tests to tell apart, below.
- If this only happens after the PC wakes from sleep, that’s a distinct resume-handshake issue — see our monitor won’t wake from sleep guide instead.
Test 1: Does the menu button bring up anything?
Press the monitor’s physical Menu or Input button while the screen is black.
- The OSD menu appears, overlaid on the black screen. The monitor’s scaler, backlight, and power board are all functioning — they’re what render that menu. The fault is upstream: a cable, the wrong input source, or the connected device isn’t sending a picture. Work through our monitor no signal fix list from there.
- Nothing happens at all, no menu, no response. The fault is inside the monitor — most likely the power board, the backlight driver, or the T-Con board that converts the incoming signal into what the panel displays. This points toward a hardware repair or replacement rather than a cable swap.
Test 2: The flashlight test, for a confirmed backlight failure
If the menu button test is inconclusive, or you want to confirm a backlight failure specifically before buying a replacement, shine a phone flashlight directly against the panel from a few inches away, in a dark room, while the source device is on and should be displaying something.
- You can faintly see a desktop, a cursor, or window shapes underneath the beam. The panel is still receiving and rendering a real video signal — the backlight that’s supposed to illuminate it has failed. This is a genuinely different failure than a true dead panel: the electronics between the cable and the pixels are working, only the light source behind them isn’t.
- You see nothing at all, even faintly, with the flashlight held close. The panel itself, or the video processing feeding it, has failed rather than just the backlight.
If the screen went black right as Windows was loading
A screen that shows the manufacturer boot logo and BIOS/POST screen normally, then goes black specifically once Windows starts loading the desktop, is a software problem, not a hardware one — almost always a GPU driver that failed to initialize correctly after a Windows update or a graphics driver update. Press Windows key + Ctrl + Shift + B. This resets the Windows display driver in about a second — the screen will flash or briefly go black and you may hear a short confirmation beep — without closing any open programs or restarting the PC. If that doesn’t bring the display back, a clean graphics driver reinstall (rather than an in-place update) resolves most of the remaining cases.
| What you see | Likely cause | What to try |
|---|---|---|
| Menu button brings up the OSD over the black screen | Signal/cable/input issue, monitor itself is fine | Follow the monitor no signal fix list |
| Menu button does nothing at all | Internal fault — power board, backlight driver, or T-Con board | Warranty repair, or replace |
| Flashlight reveals a faint image underneath | Backlight or inverter has failed | Warranty repair if 1-3 years old, otherwise replace |
| Flashlight reveals nothing at all | Panel or video processing failure | Replace — repair rarely pays off |
| Went black exactly as Windows loaded the desktop | GPU driver failed to initialize | Win + Ctrl + Shift + B, then a clean driver reinstall |
Dell SE2722HX — Best Reliable Replacement Pick
- A sensible replacement once the menu-button and flashlight tests both point to an internal fault rather than a cable or driver issue.
- Backed by Dell's standard 3-year warranty, which covers exactly the kind of backlight or power-board failure that causes a true black screen.
Black screens, by the numbers
- About one second. How long the Windows key + Ctrl + Shift + B display-driver reset takes — it reloads the current graphics driver in place without restarting Windows or closing open programs, which is why it’s worth trying before any driver reinstall or reboot.
- 1-3 years. The typical manufacturer warranty window (Dell, LG, Samsung) that covers a failed backlight or power board outright — worth checking before paying for diagnosis or repair on a monitor still inside it.
The bottom line
A black screen with the power light on and no on-screen message is genuinely ambiguous until you run one of two tests: the menu button tells you in seconds whether the monitor’s own electronics are working, and the flashlight test confirms a backlight failure specifically if the menu test doesn’t settle it. A screen that goes black exactly as Windows loads is almost always a driver fault, not a hardware one, and Win+Ctrl+Shift+B is the fastest way to rule that out. If the power light isn’t on at all, that’s a different problem — see our monitor not turning on guide — and if the screen shows an actual “No Signal” message rather than staying blank, our monitor no signal guide covers that specific, less-alarming case. A screen that strobes or flickers instead of staying solidly black has a different set of causes — see our monitor flickering guide — and a monitor that simply won’t show up as a second display, rather than going black on its own, is covered in our second monitor not detected guide. A screen that’s still showing a picture, just faded or flat rather than dark, is a different case entirely — see our monitor colors washed out guide instead.