Input Signal Not Found for PC But not Macbook

[asdfasdfasdfas4]

Hi, 

My monitor is not connecting to my Lenovo Thinkpad running Windows 11. I've tried restarting, checking for new drivers, resetting the monitor, unplugging everything and starting over, disconnecting any other devices, etc. I've tried everything I could find online or on the HP support site.  

However, the display works fine when connected to my Macbook Pro. In fact, it was working fine on my Thinkpad, I connected to my Macbook and then when I went back to the Thinkpad it stopped working. I suspect that may be related to the problem. 

Thanks for any help. 

[itsmyname]

@asdfasdfasdfas4 -- is this your monitor: HP VH240a Display - Product Specifications | HP® Customer Support

The page shows one VGA video-input and one HDMI video-input.

Does your Thinkpad have both VGA and HDMI video-output, or just one port?

Does your Macbook have VGA output and some other output, with an adapter to produce HDMI-output, or VGA-output, to feed to your monitor?

You must use the OSD (On Screen Display) buttons on your monitor to tell the monitor to "listen" to the VGA-input or to the HDMI-input, depending on which video-cable you are using to connect to your computer(s).