Check Signal Cable

[Svanhorn-61]

Came home today and the computer was powered down. The computer doesn’t seem to want to boot up properly and the display has the bouncing “check signal cable” message.

HELP!

[Lil_Boy_Blue]

Hi
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

The fault may lie in the graphics card.

https://www.techwalla.com/articles/how-to-check-the-signal-cable-on-a-pc

[Svanhorn-61]

I followed the instructions but never did get a prompt so that I could hit F2. Kept hitting the escape button continuously but all I keep getting is the bouncing check signal cable box on the display. Any other suggestions?

[Svanhorn-61]

Also what is interesting is that both fans inside the computer initially turn on but then both turn off as the computer is on for a few seconds

[Lil_Boy_Blue]

Sorry beyond my capabilities.

IF the keyboard does not respond then I believe it is a fundamental problem with the Main Board.

Hi
Hopefully one of these documents will cover (and solve) your problem...

https://support.hp.com/ca-en/document/c00042629

https://support.hp.com/us-en/document/c02693833

Turn off the computer, and then connect the power cord.
Press and hold the Windows key and the B key at the same time, and then press and hold the power button for 2 to 3 seconds.
Release the Power button but continue pressing the Windows and B keys. You might hear a series of beeps.
The HP BIOS Update screen displays and the recovery begins automatically. Follow any on-screen prompts to continue the startup to complete the recovery.
HP BIOS Update recovery in progress

If the HP BIOS Update screen does not display, repeat the previous steps but press the Windows key and the V key. If the screen still does not display, your computer might not support the feature or there is a hard drive issue. Continue to the next step to install a BIOS recovery file from the HP website.
If the Power light turns off, the Power button was held too long. Repeat the previous steps, making sure to hold the button for only 2 to 3 seconds.

Maybe a local repair shop?