Argus IT Help Desk · Computer
Monitor Not Working — Troubleshooting Steps
Find which component is failing before you submit a ticket.
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A monitor issue can be caused by any link in the chain — the monitor, its power, its cables, the dock, the dock's cables, the laptop's ports, or Windows display settings. The goal here is to help you narrow down which component is failing. Most problems resolve in a few minutes of careful checking.
🔍 First: identify your setup
🖥️ Direct connection The monitor's cable plugs straight into your laptop or desktop → see Direct connection troubleshooting. 🔌 Docking station Your laptop sits in (or cables to) a dock, and the monitors connect to the dock → see Docking station troubleshooting. This is the most common Argus office setup, with more potential failure points. 🤷 Not sure Trace the monitor cable back. Straight into the laptop, or into a black box on the desk that also connects to your laptop? A box in between means you have a dock.
⚖️ Quick diagnostic — what is the monitor doing?
- Completely black, no light at all → Power checks
- Light on (orange/amber/blinking) but no image → No signal checks
- Image present but distorted, wrong colours, wrong resolution → Image quality
- Two monitors, one works and one doesn't → Dual monitor issues
- Works sometimes, cuts out → Intermittent issues
🔋 Power checks (monitor is completely dark)
1 Look for the monitor's power light — a small LED on the front edge or bottom. Green/white = on, amber/orange = standby, off = no power. Amber with no image? It has power but no video signal — skip to No signal checks. 2 Check the power — cable firm at the back of the monitor and at the outlet; test the outlet with something else (phone charger, lamp); press the monitor's power button; and if it's on a power bar, make sure the bar is switched on. 3 Try a different outlet — unplug from the wall, plug into a known-working outlet, press the power button again. 💡 Still no light at all? The monitor may have failed — submit a ticket.
📡 No signal checks (direct connection)
Monitor on (amber light) but showing "No Signal" or "Check Cable"? The video isn't reaching it. Using a dock? Skip to the dock section below. 1 Check the input source. Monitors have several inputs (HDMI 1, HDMI 2, DisplayPort, VGA, USB-C). Find the Input or Source button on the front, bottom, or side and press it to cycle through until you hit the right one. Unsure which? The port on the back where your cable plugs in is usually labelled. 2 Check the cable. Firm at the monitor end, firm at the computer end. Unplug both ends, wait a few seconds, plug back in — connections work loose without looking loose. Screw-down cable (DVI, VGA, some DisplayPort)? Finger-tighten the screws. 3 Try a different port on the computer. Many laptops have several video outputs, and ports can fail individually. If it works on another port, note which one failed in your ticket. 4 Try a different cable — borrow one from a working monitor. If that fixes it, your cable is bad. 5 Restart the computer. Save your work first; the video output sometimes gets stuck. 6 Try Windows + P. A menu appears — PC screen only / Duplicate / Extend / Second screen only. Arrow to Duplicate and press Enter to force Windows to mirror onto the external monitor. 💡 If Duplicate works but Extend doesn't, the issue is in Windows display settings rather than hardware.
🔌 Docking station troubleshooting
Docks sit between the laptop and monitors, adding failure points: dock power, dock-to-laptop cable, the laptop's USB-C/Thunderbolt port, the monitor cables, and the dock itself.
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Best practice: power on the laptop through the dock Connect the laptop to the dock first, then press the laptop's power button — or the dock's own power button if it has one. This ensures the dock is fully initialized when Windows boots. Turn the laptop on first and then connect, and Windows often fails to detect the dock's monitors until you reconnect or restart. 1 Confirm the dock has power. Look for a power indicator (solid white, green, or blue). No light? Check the dock's own power adapter (separate from the laptop charger), test the outlet, and check the dock's power button. A dock with no power gives the laptop no monitors, no USB, nothing. 2 Re-seat the dock cable. Argus uses cable docks — one USB-C, Thunderbolt, or proprietary cable to the laptop. Unplug, wait 5 seconds, plug back in firmly at both ends. A connection that looks fine can still be partial. 3 Test the dock-to-laptop cable. Try a different cable of the same type (borrow from another dock). Then try a different port on the laptop — ports fail individually. 4 Test the monitor cables. Unplug and firmly re-plug at the dock end and at the monitor end. Try a different cable. If the dock has multiple video outputs, move the cable to a different output — dock outputs can fail independently. 5 Swap to a known-working dock of the same model. Borrow one (with permission). Laptop fine on the other dock → your dock is the problem. Still broken → the laptop is. This swap test is the single fastest way to tell dock from laptop. 6 Bypass the dock entirely. Plug the monitor cable directly into a video port on the laptop. Works direct but not through the dock? The dock is the problem.
🗇 Dual monitor issues (one works, one doesn't)
1 Confirm both monitors have power (check their power lights). 2 Swap the two cables at the dock or computer end. Failure follows the cable → cable is bad. Failure stays with the same monitor → monitor or its port is bad. 3 Swap the two cables at the monitor end (if both use the same cable type). Same logic. 4 Windows + P → Extend to make sure Windows is extending across both displays rather than duplicating or using one screen. 💡 This systematic swapping is exactly how technicians isolate a failing component — and you can do it yourself in under a minute. It's also the single most useful thing to report in a ticket.
🎨 Image quality and resolution
Wrong resolution Right-click the desktop → Display settings → Display resolution → choose the (Recommended) option. Native resolution not listed? The display driver may need updating — submit a ticket. Everything too big or too small Right-click the desktop → Display settings → Scale → try 100% (or 125% on some monitors). Colours look off Restart first — most colour issues clear. Still wrong? Try a different cable. Still wrong after that, the monitor may be failing.
🔁 Intermittent connection issues
- Check every connection point is firmly seated — monitor, dock or computer, dock-to-laptop.
- Check for cable damage — kinks, bent connectors, cables crushed under chair wheels.
- Try a different cable as a longer-term test.
- Using a dock? Intermittent problems are usually the dock-to-laptop cable or the dock itself — run the swap test above.
💡 Intermittent faults are the hardest to diagnose because they don't reproduce reliably. The more you can document — when it happens, what's running, what temporarily fixes it — the faster it gets resolved.
🆘 When to submit a ticket — and what to include
- You've worked the relevant steps and it still doesn't work.
- You've isolated the problem to a component (cable, dock, port, monitor) that needs replacing.
- Physical damage — cracked screen, dead pixels.
- Multiple monitors or docks failed at the same location (may indicate something wider).
Include: the laptop or computer's asset tag · setup type (direct or dock, and which dock model) · exactly what's happening · what you've tried — 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 · when it started and what changed · is anyone else at the location affected? · a phone photo of the connections at the back of the monitor and dock.
ArgusIT KB# 150002 · Tags: monitor · monitor blurry · monitor not turning on · monitor turning off · dock · no signal
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