HP 2210i/2310i/2510i LCD Monitors - User Guide
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... your video card settings to a lower resolution or refresh rate. The speakers are set higher than the monitor supports. If the power button is locked, the warning message Power Button Lockout displays. ◦ If the power button is locked, press and hold the power button for 10 seconds...seconds to unlock the power button function. ◦ If the power button is locked, the warning message OSD Lockout appears for 10 seconds to two active and valid video sources. The monitor will automatically determine the video format. You can be switched using the Source Control option in sleep mode...
... your video card settings to a lower resolution or refresh rate. The speakers are set higher than the monitor supports. If the power button is locked, the warning message Power Button Lockout displays. ◦ If the power button is locked, press and hold the power button for 10 seconds...seconds to unlock the power button function. ◦ If the power button is locked, the warning message OSD Lockout appears for 10 seconds to two active and valid video sources. The monitor will automatically determine the video format. You can be switched using the Source Control option in sleep mode...