Problems with startup gray screen

Hello everyone I'm new in the forum and also in the world of mac.
I just got the iMac 21.5 "for 2 days.
Last night I switched to install the HP LaserJet multifunction CD loaded installed and rebooted the Mac as he said, everything ok ...
After that I put the CD as the print server for network installation, I booted the installation but before he reached the end of the installation, the monitor has dropped a patina gray with the center of the inscription in English and hold the button Once closed off and press again the power ....?
Having done as he said the Mac has been restarted but the monitor just turns white and appears the apple falls gray patina with the same message in English to restart ..
After an hour lost to reboot and restart sonoinnervosito me, and I try via forums if someone can help me ..
I have already added the photos and I would not format .. thanks

Alberto,
David is correct remove the HP software you installed, you can use AppCleaner to help you do that.
Next do a software update to ensure you have the most up-to -date software for your iMac. Then follow the Connect Your Printer instructions and see if your AIO is found. If it is then you will know it's a supported printer. If it does not find your AIO then download the latest HP Drivers and again try the Connect your Printer link.
Regards,
Roger

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