Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
When you turn the computer on, do you hear any noise from fans, or from the disk-drive, or from the CD/DVD device?
Does it "beep" exactly once, after successfullyl completing the POST (Power On Self Test) ?
It could be the power-supply, or the motherboard, or the CPU that has failed. More details, please.
Or, just take the computer (and its external power-supply) to a qualified computer technician, for trouble-shooting.
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