You press the power button on your monitor and nothing happens. No light, no logo, no flicker. Before you start shopping for a replacement, know this: the monitor itself is usually fine. In my years at the help desk, I'd say 8 out of 10 dead monitors come down to one of three things. I'll list them in the order I'd check them—most common first.
1. The Monitor Isn't Getting Power (Most Common)
This sounds obvious, but you'd be surprised how often it's something dumb. The monitor's power cable is loose, the outlet is dead, or the power strip got switched off.
What to do:
- Unplug the power cable from the back of the monitor and from the wall outlet or power strip.
- Plug it back in firmly. You should hear or feel a click on both ends.
- Check the power strip's switch and the master switch on the wall outlet (if it has one). Flip them off and on.
- Plug something else you know works—like a lamp—into the same outlet. If the lamp doesn't light, the outlet's the problem, not the monitor.
- Look at the monitor's power LED. If it's off completely, press the power button on the monitor itself (not the remote, if it has one).
What you should see: After reconnecting power, the LED on the monitor should glow—usually amber or blue. If it's still dark, try a different power cable. I've seen cats chew through these more often than you'd think.
If the LED lights up but the screen stays black, skip to the next section.
2. The Cable Between Monitor and Computer Is Bad or Loose
So the monitor's getting power (LED is on), but you're staring at a black screen. The next suspect is the video cable. This is the #1 cause of "no signal" messages and black screens after a computer's been moved or a desk got bumped.
What to do:
- Check both ends of the cable connecting your monitor to your computer. Push them in firmly. I mean firmly—HDMI and DisplayPort cables can sit half-seated and still look connected.
- If you're using VGA or DVI, screw in the thumb screws hand-tight. Don't force them, but they shouldn't wiggle.
- Try a different cable if you have one. This is the fastest way to rule out a bad cable. I've seen HDMI cables fail after being bent one too many times—no visible damage, just dead.
- If your monitor has multiple input ports (like HDMI 1, HDMI 2, DisplayPort), try plugging into a different port on the monitor.
What you should see: If the cable was loose, the screen should wake up within a second or two. If you swapped cables and it still doesn't show, move on.
One thing to note: if you're using an adapter (like USB-C to HDMI), that adapter can be the weak link. Try connecting without the adapter if your monitor and computer have matching ports.
3. The Monitor Is Set to the Wrong Input Source
This one's sneaky because the monitor looks dead—no signal, black screen—but it's actually working fine. It's just looking at the wrong input. Maybe you bumped the input button, or someone else changed it. Older monitors are especially bad about this.
What to do:
- Find the input/source button on your monitor. It might be labeled "Input," "Source," or have an icon that looks like a square with an arrow entering it. It's usually on the front or bottom edge.
- Press it. This cycles through the available inputs: HDMI 1, HDMI 2, DisplayPort, VGA, etc.
- Watch the screen as you press. You should see a small menu pop up in a corner showing the current input. Stop when you hit the one your computer is plugged into.
- If you don't know which input your computer uses, look at the port on the back of your computer—match it to the cable type.
What you should see: As you cycle, the menu shows the input names. When you land on the right one, the screen should light up with your desktop. If you cycle through all inputs and none show a picture, you've got a deeper issue—but try the next step anyway.
If you're using a laptop, also check if it's set to display on the monitor. On Windows, press Windows + P and select "Duplicate" or "Extend." On a Mac, go to System Preferences > Displays and click "Detect Displays." Laptops sometimes decide to send video to the built-in screen only.
Quick Reference Summary
| Cause | Symptom | Fix |
|---|---|---|
| No power | LED completely off | Reconnect power, test outlet, check power strip |
| Bad/loose cable | LED on, black screen | Reseat cable, try another cable/port |
| Wrong input | Black screen, maybe "No Signal" | Cycle input source with the monitor's button |
If you've gone through all three and the monitor still won't show anything, it's time to test with another computer or laptop. Borrow a friend's laptop, plug it into the same cable. If that works, the problem's on your computer's side, not the monitor. If it still fails, the monitor might genuinely be dead—but that's rare. Most times, it's one of these three, and you just saved yourself $200.