Hi @tc4444
Welcome to the HP Support Community. I'd be happy to assist you with the monitor issue.
Please try these steps - Monitor is Blank
If the issue still persists, I'd suggest you Contact HP in your region regarding this.
If you are having trouble navigating through the above options, please send me a private message with the region you are contacting us from. Check next to your profile Name, you should see a little blue envelope, please click on it.
Hope this helps! Keep me posted.
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Have a great day!
Asmita
I am an HP Employee