My Hp All-In-One Desktop Has a Dark screen and the keyboard and mouse are not working.

[Michael Ntui]

My Hp All-In-One Desktop12 generation Has a dark screen and the keyboard and mouse are not working. (I know this because the keyboard and mouse usually light up), but when I turned it On, it was only the indicator light on the PC that came up, I've tried all the troubleshooting but still no response, the ram was changed but still no response, so I am suspecting the Ram wasn't compatible, is there anything else I can do?

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