I am helping an elderly neighbor with an issue with his HP Pavilion 21 All-in-one desktop which is relatively new. According to him yesterday he was asked to install HP updates which he did then was asked to reboot. On the reboot the monitor right away just became dead, just black. It does not light up no BIOS screen nothing. The power button does light up so it is getting power. Several times we tried hitting the power button on and off and also unplugging and re-plugging the power cord and still nothing. Any ideas on what could be wrong? Any ideas on how to fix?
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