Power off and on your PS5. If the console turns on but does not boot up, press and hold the power button until the blinking LED turns off. Unplug the power supply and let the console sit for 20 minutes, then plug it back in and try turning on the system. Use a different power cord. Check that the TV is set to the correct channel to display the input from the PS5™ console. Unplug the HDMI cable from your console and use it on any other HDMI-enabled devices you might have around the house, like a laptop connected to the TV or a DVD player. https://www.weboquest.com/playstation-5-not-working/

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