@Juhjuhbinks Welcome to HP Community!
Here's what you need to know and do, to resolve this issue:
Step 1: Remove discs and devices
Before troubleshooting startup issues, remove or disconnect all discs and devices from the computer.
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Turn off the computer.
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Remove any discs and USB devices.
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Remove memory cards from the card reader slot.
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Disconnect all non-essential devices such as printers, scanners, external hard drives.
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Leave only the mouse, keyboard, and monitor connected.
After you have removed all discs and devices, turn on the computer.
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If the computer starts, reconnect devices one at a time, to determine which disc or device is causing the problem. If the issue is solved, troubleshooting is complete.
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If the computer still does not start and exhibits the same problem, press and hold the Power button to turn off the computer. Do not connect anything, and then continue troubleshooting.
Step 2: Perform a hard reset
Many startup errors and other problems can be resolved by decreasing the amount of power stored in hardware components. Decreasing stored power is sometimes referred to as a Hard Reset.
After you have completed these steps, if the computer startup issue is resolved, go to HP PCs - Updating Drivers and Software with Windows Update (Windows 10, 8, 7), and then go to HP PCs - Using HP Support Assistant (Windows) to update all device drivers.
FOR DETAILS & FURTHER INSTRUCTIONS, USE THIS LINK: CLICK HERE & SKIP TO STEP 2 ONWARD
(By the end of this article all the issues should be resolved)
Let me know how that pans out,
If you feel I was helpful, simply click on Accept as Solution to help the community grow,
That said, I will have someone follow-up on this to ensure you've been helped,
Just in case you don't get back to us within 24 - 48hrs, and have a good day, ahead.
Riddle_Decipher
I am an HP Employee