Monitor Not Working — Troubleshooting Steps

ℹ️ This article walks you through troubleshooting a monitor that won't display, displays incorrectly, or has intermittent issues. Most monitor problems are caused by power, cables, docks, or input selection — and most can be resolved in a few minutes of careful checking. If these steps don't resolve the issue, the bottom of this article explains what to include when you submit a ticket so we can resolve it quickly.

A monitor issue at Argus can be caused by any of several different components in the chain — the monitor itself, its power, its cables, the dock (if you use one), the dock's own cables, the laptop's ports, or even the laptop's display settings. The goal of this article is to help you narrow down which component is failing before you submit a ticket.

🔍 First: Identify Your Setup

How is your monitor connected to your computer? This determines which section of the article applies to you.

• 🖥️ Direct connection — Monitor's cable plugs directly into a port on your laptop or desktop computer. → See "Direct Connection Troubleshooting" below.
• 🔌 Docking station — Your laptop sits in (or is cabled to) a dock, and one or more monitors are connected to the dock. → See "Docking Station Troubleshooting" below. This is the most common Argus office setup and has more potential failure points.
• 🤷 Not sure — Look at your monitor's cable. Trace it back. Does it go directly into your laptop, or does it go into a black box on your desk that ALSO connects to your laptop? If there's a box in between, you have a dock.

⚠️ Quick Diagnostic — What Is the Monitor Doing?

• 🟡 Completely black, no light on the monitor at all → Start with "Power Checks" below.
• 🟡 Monitor light is on (orange / amber / blinking) but no image → "No Signal" — go to "No Signal Checks" below.
• 🟡 Image is there but distorted, wrong colours, or wrong resolution → See "Image Quality and Resolution Issues" below.
• 🟡 Dual monitor setup — one monitor works, the other doesn't → See "Dual Monitor Issues" below.
• 🟡 Monitor works sometimes, disconnects intermittently → See "Intermittent Connection Issues" below.

Power Checks (Start Here If the Monitor Is Completely Dark)

Step 1: Look for the monitor's power light

Most monitors have a small LED on the front edge or bottom — green or white when on, amber/orange when in standby, off when no power.

• No light at all → Power problem. Continue to Step 2.
• Amber/orange light, no image → Monitor has power but isn't receiving a video signal. Skip to "No Signal Checks" below.

Step 2: Check the monitor's power

1. Confirm the monitor's power cable is plugged into the back of the monitor firmly.
2. Confirm the other end is plugged into a wall outlet or power bar.
3. Test the outlet — plug something else into it (phone charger, lamp) to confirm it has power.
4. Press the monitor's power button (usually on the front edge or bottom).
5. If the monitor was on a power bar, confirm the power bar is switched on.

Step 3: Try a different outlet

If the outlet seems dead or the monitor still won't power on:

1. Unplug the monitor power cable from the wall.
2. Plug it into a different known-working outlet.
3. Press the monitor power button again.

If the monitor still shows no light, it may have hardware failure. Submit an IT ticket.

No Signal Checks

If the monitor is on (amber/orange light) but shows no image — usually with a "No Signal" or "Check Cable" message that disappears after a few seconds — the video isn't reaching it.

If you're using a DOCK, skip to "Docking Station Troubleshooting" below.

If you have a DIRECT connection:

Step 1: Check the monitor's input source

Most monitors have multiple input options (HDMI 1, HDMI 2, DisplayPort, VGA, USB-C, etc.) and may be set to the wrong one.

1. Find the Input or Source button on the monitor — usually on the front, bottom, or side edge.
2. Press it repeatedly to cycle through inputs until you find the one your cable is using.
3. If unsure which input you're using, look at the back of the monitor where your cable plugs in — the port is usually labelled.

Step 2: Check the cable

1. Confirm the video cable is plugged in firmly at the monitor end. Push it in until it stops moving.
2. Confirm the same cable is plugged in firmly at the computer end.
3. Unplug both ends, wait a few seconds, plug them back in. Sometimes the connection has worked loose but doesn't look it.
4. If you have a screw-down cable (DVI, VGA, some DisplayPort), confirm the screws are finger-tight.

Step 3: Try a different port on the computer

Many laptops have multiple video output ports (HDMI, USB-C, DisplayPort). Ports can fail or become unreliable. If your computer has more than one video port:

1. Disconnect the cable from the current port.
2. Plug it into a different video port on the same computer.
3. If the monitor now works, the original port has a problem — submit an IT ticket noting which port failed.

Step 4: Try a different cable

Video cables can fail — especially around the connectors. If you have a spare cable (or can borrow one from a working monitor at another desk):

1. Disconnect your current cable from both ends.
2. Plug in the replacement cable at both ends.
3. If the monitor now works, the original cable is bad. Submit a ticket for a replacement cable.

Step 5: Restart the computer

Sometimes the video output gets stuck. With the monitor still connected:

1. Save any work.
2. Restart the computer (Start → Power → Restart).
3. Wait for it to fully boot.

Step 6: Try Windows + P

If the computer is on but you're not sure if it's outputting to the monitor at all:

1. Press Windows key + P on the keyboard.
2. A small menu appears with options: PC screen only / Duplicate / Extend / Second screen only.
3. Use the arrow keys to highlight Duplicate, then press Enter.
4. This forces Windows to mirror the laptop screen onto the external monitor.

If Duplicate works but Extend doesn't, the issue may be in Windows display settings rather than hardware.

Docking Station Troubleshooting

Docks are a common point of failure because they sit between the laptop and the monitor(s), adding several places where things can go wrong: dock power, dock-to-laptop cable, dock USB-C/Thunderbolt port, monitor cables from the dock, and the dock itself.

Best Practice: Power on the laptop through the dock

When your laptop is sitting in or connected to a dock, the recommended way to wake it up is to press the laptop's power button while it's already connected to the dock — OR, if your dock has its own power button, use that. This ensures the dock is fully initialized when the laptop boots and helps Windows detect the monitors correctly.

If you turn the laptop on first and then connect to the dock, Windows sometimes fails to detect the dock's monitors until you reconnect or restart.

Step 1: Confirm the dock has power

1. Look at the front of the dock — is there a power indicator light? It should be on (usually solid white, green, or blue).
2. If the dock has no light, check:
   • The dock's own power adapter is plugged in (most docks have their own power brick separate from the laptop charger).
   • The wall outlet has power (test with another device).
   • The dock's power button (if it has one) is on.
3. A dock with no power means the laptop will not get monitors, USB, or anything else from it.

Step 2: Confirm the dock cable is firmly connected

Argus uses cable docks — a single USB-C, Thunderbolt, or proprietary cable connects the laptop to the dock. Unplug the cable, wait 5 seconds, then plug it back in firmly at both ends (dock side and laptop side). A dock connection that looks fine can still be partial. Re-seating is a one-second fix worth trying first.

Step 3: Test the dock-to-laptop cable

If the monitors still won't appear after re-seating:

1. Try a different cable of the same type if one is available. Borrow one from another dock if you have to. If a different cable works, your original cable is bad.
2. Try a different port on the laptop. Most modern laptops have multiple USB-C / Thunderbolt ports — try plugging the dock cable into a different one. Ports can fail individually.

Step 4: Test the monitor cables (dock to monitor)

If the dock is powered, the laptop is properly connected, but a monitor still shows no signal:

1. Unplug the monitor's cable from the back of the dock, then plug it back in firmly.
2. Unplug the same cable from the back of the monitor, then plug it back in firmly.
3. Try a different cable between the monitor and the dock if one is available.
4. If your dock has multiple video outputs (e.g., two HDMI ports, or HDMI + DisplayPort), try moving the cable to a different output on the dock. Dock outputs can fail independently.

Step 5: Swap to a known-working dock of the same model

If your office has multiple docks of the same type and you suspect yours is failing:

1. Borrow a dock from another desk (with permission) that you know is working.
2. Disconnect your laptop from the suspect dock and connect it to the borrowed one (using its cables, monitors, etc., or use a desk where both setups exist).
3. If your laptop works fine on the other dock → your original dock is the problem. Submit a ticket noting which dock failed.
4. If your laptop still has issues on the other dock → the problem is the laptop, not the dock.

This swap test is the single fastest way to determine whether the dock or the laptop is causing the issue.

Step 6: Bypass the dock

To rule the dock out entirely, try connecting your monitor directly to the laptop (using a cable that goes from monitor straight into the laptop's HDMI / USB-C / DisplayPort, not through the dock):

1. Disconnect the monitor cable from the dock.
2. Plug the same cable (or a different one if needed) directly into a video port on the laptop.
3. Power on or wake the monitor.

If the monitor works direct but not through the dock, the dock is the problem.

Dual Monitor Issues (One Works, One Doesn't)

If you have two monitors and only one is working:

1. Confirm both monitors have power (look at their power lights).
2. Swap the two monitor cables at the dock or computer end. If the failure follows the cable → cable is bad. If the failure stays on the same monitor → monitor or its dedicated port is bad.
3. Swap the two monitor cables at the monitor end (only relevant if both monitors use the same cable type — e.g., both HDMI). If the failure follows the cable → cable. If it stays with the monitor → monitor.
4. Try Windows + P → Extend to ensure Windows is set to extend across both displays, not duplicate or single-screen.

This systematic swapping is how technicians isolate which component is failing — and you can do it yourself in under a minute.

Image Quality and Resolution Issues

If the monitor shows an image but it's blurry, wrong size, wrong colour, or has obvious display problems:

Wrong resolution

1. Right-click the desktop → Display settings.
2. Scroll to Display resolution.
3. Choose the (Recommended) option for the affected monitor.
4. If the monitor's native resolution isn't listed, the display driver may need to be updated — submit an IT ticket.

Wrong scaling / everything looks too big or too small

1. Right-click the desktop → Display settings.
2. Scroll to Scale.
3. Try 100% (or 125% for some monitors). Adjust until things look right.

Colours look off

1. Restart the computer first — most colour issues clear with a restart.
2. If colours are still wrong, try a different cable between monitor and computer/dock.
3. If colours are still wrong with a different cable, the monitor may be failing — submit an IT ticket.

Intermittent Connection Issues

If your monitor works most of the time but cuts out occasionally:

1. Check that all cables are firmly seated at every connection point (monitor, dock or computer, dock-to-laptop).
2. Check for cable damage — kinks, bent connectors, cables that have been crushed under chair wheels.
3. Try a different cable as a long-term test.
4. If you use a dock, intermittent issues are often the dock-to-laptop cable or the dock itself. Try the swap test in Step 5 of "Docking Station Troubleshooting."

Intermittent issues are often the hardest to diagnose because they don't reliably reproduce. The more you can document — when does it happen, what's running, what fixes it temporarily — the easier it is to resolve.

When to Submit a Ticket

Submit a ticket if:

• You've gone through the relevant steps above and the monitor still doesn't work.
• You've isolated the problem to a specific component (cable, dock, port, monitor) that needs to be replaced.
• The monitor is showing physical damage (cracked screen, dead pixels, etc.).
• Multiple monitors / docks have failed at the same location (could indicate a wider problem).

What to Include in Your Ticket

Good answers here let us fix the problem much faster.

1. Your laptop or computer's asset tag — the small Argus IT label on the device.
2. Setup type — direct connection, or via a docking station? Which dock model if known?
3. What exactly is happening — completely dark, no signal, intermittent, wrong resolution, dual monitor failure, etc.
4. What you've already tried from this article. Be specific — "I swapped the monitor cable between the two displays and the failure followed the cable" tells us the cable is bad. "I tried other things" tells us nothing.
5. When did this start — did anything change recently? Did you move desks, get a new dock, return from a long weekend, etc.?
6. Is anyone else at the same location affected? (Yes / No / Don't know.)
7. Photo of the setup — a quick phone photo of the connections at the back of the monitor and dock can save a lot of back-and-forth.

Related Articles

• How to Request New Hardware (KB-200001) — for replacement monitors, docks, or cables

KB-150002 | Updated: May 20, 2026 | Originally created: February 11, 2019