What's going on

The BenQ ZOWIE XL2546K is a flagship 240Hz esports display designed for intense high-framerate gaming. Because it pushes a heavy payload of data over DisplayPort 1.2 to sustain high refresh rates alongside DyAc+ backlighting, the video connection relies on precise link-training handshakes between your graphics card and the monitor's scalar.

When you encounter a "No Signal Detected" message, it typically indicates that the link training process failed, the cable bandwidth is insufficient for 240Hz, or a USB-C to DP adapter isn't supplying proper DisplayPort Alternate Mode protocols. If you're managing multiple setups, check our general monitor troubleshooting guide for broader signal issue patterns.

Symptoms people notice

• Screen displays "No Signal Detected" despite the PC being powered on.
• System works at 60Hz over HDMI, but cuts to black immediately when switched to DisplayPort at 240Hz.
• Laptops connected via USB-C hubs fail to recognize the BenQ display entirely.
• Random black screens lasting 2–3 seconds while playing games or changing resolutions.
• The monitor stays asleep when the computer wakes up, requiring a hard power plug pull.

Likely causes

1. High-Bandwidth Cable Degradation: 240Hz at 1080p requires full VESA-certified DP 1.2/1.4 throughput. Aging or cheap cables frequently drop packets.
2. DisplayPort Deep Sleep Lockup: The XL2546K scalar board gets stuck in a low-power state and ignores incoming GPU sync signals.
3. USB-C Adapter Incompatibility: The host device's USB-C port lacks DP Alt-Mode capability, or the adapter is unidirectional (DP to USB-C instead of USB-C to DP).
4. GPU Driver Link Failure: Display drivers fail to perform proper handshake negotiation during Windows boot or resolution switching.
5. Bent Port Pins: Physical wear or strain on the monitor's DP receptacle causing ground or lane drops.

Quick checks first

Before assuming internal hardware failure on your BenQ ZOWIE series monitor, try these quick non-invasive steps:

• Reseat the DP Cable: Completely detach both ends of the DisplayPort cable, check the connectors for bent pins, and firmly plug them back in until they click.
• Bypass Hubs and Docks: Connect your USB-C to DP cable directly into your laptop port rather than passing through unpowered USB hubs or KVM switches.
• Test HDMI Output: Plug in an HDMI cable to verify whether the PC graphics card and the monitor's panel are operational.
• Restart GPU Drivers: Press Win + Ctrl + Shift + B on Windows to force a graphics driver refresh without restarting your PC.

When it's a real hardware fault

If you have swapped cables, tested multiple computers, and verified the source GPU works on other displays, the XL2546K's mainboard or input connector may be damaged. Physical damage to the DisplayPort connector pins is common if cables are yanked without depressing the latch button.

Furthermore, internal scalar chip failures can prevent high-frequency differential signalling from processing even if low-frequency HDMI signals pass through. Read through our hardware reviews to understand how different monitor board designs hold up under continuous high-refresh usage.

Soft resets vs board/panel work

Soft troubleshooting—such as flea-power draining, driver reinstallation, and turning off DP Sleep in the OSD—resolves roughly 80% of DisplayPort handshake issues. These steps are risk-free and take only minutes.

However, opening the chassis to work on the power board, replacing damaged DisplayPort female connectors, or reflashing firmware via dedicated hardware programmers requires specialized tools. The TN panel and fragile ribbon cables inside the XL2546K can easily be damaged during DIY tear-downs. If soft resets fail, board repairs or warranty claims are recommended over opening the display casing yourself.

Next steps

Start by isolating the problem to either the cable, the source PC, or the monitor itself. Test the XL2546K on another PC using a brand-new VESA-certified DisplayPort 1.4 cable. If connecting a USB-C device, double-check your laptop's spec sheet to confirm USB-C DP Alt-Mode support. If all signal tests fail across multiple devices and inputs, consult BenQ support or a professional electronics technician to evaluate scalar board health.