six beeps while switch on the cpu with no display

[HR20]

six beeps while switch on the cpu with no display

[Lil_Boy_Blue]

Hi
Depending on the age of the PC and the BIOS vendor...
https://support.hp.com/us-en/document/bph07107

Possibly

Power button LED blinks 6 times with 6 beeps

Video Card or Graphics

Reset the graphics card (if applicable). If the problem is not resolved, remove other accessory cards, and replace the graphics card or Main-Board.

Not likely

LED blinks 6 times

BIOS

BIOS authentication failure.

Restore BIOS if available.

Press the Windows  + B keys to do a BIOS recovery or replace the Main-Board.

[HR20]

No Graphics card on this system.

[HR20]

Power button LED blinks 6 times with 6 beeps

[Lil_Boy_Blue]

Hi

So it's the Video / Grahics card then.

https://support.hp.com/gb-en/product/hp-p2-1400-desktop-pc-series/5330789/model/5331829/product-info

Video graphics

Intel PCH Integrated Graphics

*Integrated video is not available if a graphics card is installed.

Integrated graphics provided by processor installed in the system

• VGA connector on back I/O
• DVI connector at back I/O

Try installing a basic Video card and hope the on-board Graphics turns OFF and the installed card generates a default screen.

Next may be either a replacement CPU or Main Board, or a local repair shop.