Forum Discussion
False monitor disconnects after screen turns off
A friend has a Beelink U59 computer running Window 11 Pro, fully updated including drivers. It is connected to a Hisense Fire TV model 43QD65NF running Fire OS 7.7.1.1 (latest), used only as a monitor, via HDMI. Resolution is set to 3840x2160 at 60 Hz. System is set to turn off screen after 10 minutes, not ever sleeping or hibernating.
When the screen turns off, the monitor displays "no signal" then powers off after a few minutes, as expected. But until the monitor turns off, the system plays (through speakers connected via the 3.5 mm jack) obnoxious beeps about every 20 seconds, apparently because the system sees the monitor as being repeatedly disconnected and reconnected. During this time, if the monitor is powered off manually, the beeping stops and all is well.
Trying the other HDMI output (this computer has two, though only one is being used) did not help, nor did trying another HDMI cable or a different HDMI input on the monitor. A Mac M1 Mini was previously connected to this monitor and caused no trouble.
Is there a setting or update that might correct this issue?
3 Replies
When the monitor enters power-saving mode (screen off), Windows may temporarily lose and then re-establish the display signal, causing the system to think the monitor was disconnected and reconnected.
Your friend's Beelink U59 PC is experiencing repeated "monitor disconnect/reconnect" events when the display turns off, causing system beeps and the monitor's "no signal" message. Since the problem persists across different HDMI outputs, cables, and even when switching inputs on the monitor, it suggests a system or driver-level issue related to HDMI recognition or power management.
Possible Causes
- The monitor’s "no signal" detection might be triggering repeated connect/disconnect signals.
- Windows might be polling the display status and causing the system to detect fluctuations.
- System or driver issues related to graphics or HDMI detection.
- Power management settings that cause the display to disconnect or reset periodically.
