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HP 22cwa
macOS 10.15 Catalina

I connected my hp monitor (22cwa) to my Mac (MacOS Catalina. Version 10.15.5) with an HDMI cord & Mini DisplayPort to HDMI adaptor. I tried it while my Mac computer was shut down after reading through other posts.

When I turn the display on the hp Display scans for an hdmi signal, but ultimately shows “no signal” every time. 
Do I need to return this?

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