Have you recently made any changes before the issue started?
Power button LED blinks 6 times with 6 beeps - This could relate to Video Card or Graphics Issue.
Let's try these steps here:
Perform a Hard reset on the PC:
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". Use the following steps to perform a hard reset on a computer:
1. If Windows is open, click Start and then Shutdown.
If Windows is not open and the computer has power, press and hold the power button on the computer until the computer shuts off.
2. With the power off, disconnect the power cord from the back of the computer.
3. With the power off and the power cord disconnected, press the power button on the computer for 5 seconds. The power light indicator on or near the power button might turn on briefly but then go out.
4. Reconnect the power cord and turn on the power.
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Have a great day!
Jeet_Singh I am an HP Employee
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