Welcome to the HP Support Community. I'd be happy to assist you with the "No Boot" issue.
Let's try these steps -
1. Shut down the computer, then disconnect the power cord from the rear of the computer.
2. Press and hold down the power button for at least 10 seconds, then release it. The power light indicator might turn on briefly then go out.
3. Reconnect the power cord, then turn on the computer to confirm if the issue is resolved.
If the issue still persists, I'd suggest you Contact HP in your region regarding the service options for your computer.
If you are having trouble navigating through the above options, it's most likely because the device is out of warranty. If yes? please send me a private message with the region you are contacting us from. Check next to your profile Name, you should see a little blue envelope, please click on it.
Hope this helps! Keep me posted.
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