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Network Switch Not Working?

A switch that's gone dark or is dropping specific ports usually has one of a handful of specific causes -- most are quick to diagnose.

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A Whole-Switch Failure Is Different From a Single Port Failure

If the entire switch is unresponsive, the cause is usually power or a hardware failure. If only specific ports have stopped working while others are fine, the cause is more likely a cable, connected device, or PoE budget issue.

Likely Causes

Why This Happens

The most common causes we find when diagnosing this fault.

Power Supply Failure

No lights at all usually means no power reaching the switch.

Single Port Failure

One port has failed while the rest of the switch works fine.

Damaged Ethernet Cable

The cable itself, not the switch, is often the actual fault.

PoE Overload

Too many powered devices drawing more than the switch can supply.

Overheating

Poor ventilation causing the switch to shut down or misbehave.

Configuration/VLAN Issue

A managed switch's settings blocking traffic on specific ports.

How It Works

Diagnose First, Then Fix

1

Tell Us What's Wrong

Describe the issue — photos or video help.

2

Diagnose

Remote diagnosis where possible, a site visit where it isn't.

3

Recommend

Repair, reconfigure, upgrade or replace — based on findings.

4

Repair & Test

Approved work carried out, then tested.

Or describe your problem on our troubleshooting page →

Related

Related Qyvea Services

Network Cabling Repair

Full diagnosis and repair for cabling faults.

Network Cabling Checklist

What proper cabling should cover, to prevent this.

Networking & Structured Cabling

Full installation and support service.
FAQ

Common Questions

How do I tell if it's the switch or the cable that's failed?

Testing the same cable on a different, known-working port (or testing a different cable on the same port) usually isolates which one is actually at fault.

Why would only some ports stop working?

This points more toward a specific port failure, a bad cable, or a PoE budget issue rather than the whole switch failing -- worth checking those first.

Can a switch really overheat and cause problems?

Yes -- switches in poorly ventilated cabinets or enclosed spaces can overheat, especially PoE switches under heavy load, and this can cause intermittent faults.

Does Qyvea repair or only replace faulty switches?

We diagnose first -- some faults are configuration issues that don't need replacement at all, and we'll tell you honestly which situation you're in.

Get Your Network Back Up

Tell us what you're seeing (which ports, any lights, when it started) and we'll diagnose it properly.

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