What's going on

When an Acer monitor loses its DisplayPort (DP) signal, it typically shows a brief "No Signal" banner before entering a dark standby mode. DisplayPort relies on a bidirectional communication handshake protocol between your graphics processing unit (GPU) and the monitor's onboard scaler microcode.

If the timing of this communication sequence is interrupted—frequently triggered by system sleep states, power save features, or subtle voltage drops—the monitor's control board stops listening to the DisplayPort receiver altogether.

Symptoms people notice

• A floating "No Signal" box appears briefly before the screen goes entirely dark.
• The monitor works normally when connected via HDMI, but fails completely on DisplayPort.
• The screen stays black when resuming activity after the PC enters sleep mode.
• Screen flashes black momentarily or cuts out at high refresh rates (144Hz, 165Hz, or 240Hz).
• Windows detects a second display in Display Settings, but the physical Acer panel remains black.
• The monitor's OSD input menu does not allow you to highlight or select DisplayPort.

Likely causes

1. DisplayPort Handshake Lock: The monitor's controller gets stuck in a logic loop and misses the wake signal sent by the GPU.
2. Deep Sleep / Energy Star Bug: Acer's power-saving modes can deactivate the DisplayPort receiver circuit completely, preventing it from auto-waking.
3. Uncertified Cable Failure: Non-VESA-certified cables can leak current on Pin 20 or degrade signal integrity under high bandwidth requirements.
4. GPU Driver Timing Issues: Windows display drivers failing to push valid EDID display data across the DisplayPort link.
5. Incorrect OSD Input Selection: The monitor is manually set to HDMI or is stuck trying to auto-detect an inactive port.
6. Hardware Board Damage: Blown ESD protection diodes or cracked solder joints on the monitor's physical DP input port.

Quick checks first

Before concluding your monitor's internal electronics have failed, rule out temporary microcode lockups and simple connection issues:

1. Flea Power Drain: Unplug the power brick or power cord from the monitor, disconnect the DP cable, and hold the monitor power button down for 30 seconds. This drains static charges on the logic board and forces a full cold boot of the internal scaler software.
2. Cable Latch Check: DisplayPort connectors feature mechanical pins. Ensure the plug is completely flush against the graphics card and monitor ports.
3. Driver Reset Shortcut: Press Win + Ctrl + Shift + B on your keyboard. This forces Windows to reload the graphics driver stack without rebooting the computer.

When it's a real hardware fault

If performing a cold power cycle, switching to a brand new VESA-certified DP cable, and adjusting Windows display parameters yields no results, the issue is likely hardware-based. Physical strain on heavy DP cables can pull on the monitor's surface-mounted port, cracking delicate internal solder pads.

Power surges or static discharges through the cable can also pop small surface-mount electrostatic discharge (ESD) protection chips near the DP input circuitry. When these components break, the monitor can no longer process digital signals, even though the panel backlight and menu buttons continue to function.

Soft resets vs board/panel work

Soft resets—such as power draining, disabling "Deep Sleep" in the OSD menu, and clearing display driver caches—resolve roughly 80% of Acer DisplayPort detection issues. They cost nothing and pose no risk to your hardware.

Opening an Acer monitor to replace the mainboard or solder a new DisplayPort jack requires disassembling high-voltage power supply sections and working with miniature surface-mount components. DIY board repair is rarely advisable due to safety hazards and the complexity of finding matching revision boards. If soft troubleshooting fails, utilizing an active HDMI connection or replacing the main board are common paths forward. Check our monitor troubleshooting hub or read our hardware reviews if you decide it's time to upgrade your setup.

Next steps

1. Perform the 30-second power drain to force the Acer control board to perform a clean boot.
2. Connect an HDMI cable temporarily so you can view the screen, enter the OSD menu, and set Deep Sleep / Auto Source to Off.
3. Replace your cable with a VESA-certified DisplayPort 1.4 or 2.1 cable.
4. Test the monitor on another PC or test a different DP output on your graphics card.
5. If the DP port remains completely unreadable across all hardware, consider using an HDMI 2.0/2.1 connection or check your warranty options with the manufacturer.