HP hardware diagnostics tool stalls at 50% when loading during startup

[Boomer1959G]

After powering on my laptop, I often receive an error of "checksum error press enter to reboot." When I reboot to go to the HP Hardware Diagnostics Tool app. The app loads to 50% and then stalls and does not load completely in order to use the app.
My particular laptop does not have a CMOS battery.

[BeemerBiker · Accepted solution]

Unfortunately this does not sound good get an air duster and see if you can clean the insides of the laptop as best you can.

Cleaning without opening the PC

How to use air duster from WIKI how
https://www.wikihow.com/Clean-a-Laptop-with-Compressed-Air

General instructions for cleaning from HP tech.
https://www.hp.com/us-en/shop/tech-takes/how-to-clean-your-laptop#

This HP video shows how to clean air vents on your laptop.

There is an updated UEFI diagnostic you can try.

HP releases newer UEFI diagnostics periodically.
When you select F2 during boot you are requesting UEFI diagnostics.
There is an updated diagnostics package Click Here
Look for the phrase 'issues outside the OS',
Expand the'+'symbol and click the DOWNLOAD button.
The version of the UEFI diagnostics is shown at the left of that DOWNLOAD button.
When you press F2 to run diagnostics please ensure the version is the new one.

It is possible to reset the cmos. There are two ways

Follow the steps below to reset computer CMOS data.

1. Turn off the computer.
2. Press and hold the Windows and the V keys.
3. While still pressing those keys, press and hold down the Power button on the computer for 2-3 seconds.
4. Release all the keys.
5. At the completion of a successful CMOS reset, a message showing CMOS Reset (502) will be displayed.
6. Restart the computer.

lf you do not see that 502 message then :

• Turn on the computer by holding the power button down for 20 full seconds then release.
• Press the Power button one more time (if necessary) to start the computer.
• Tap the ESC key about once a second after you see the LEDs on the keyboard flash.
• Press F10 to get in to bios. Check Date and time, save setting when you exit

[Boomer1959G]

I have cleaned the laptop previously. I downloaded the software you recommended and can now access the UEFI Hardware Diagnostics from within Windows, but from the boot menu the hardware diagnostics stalls at 20%.

[BeemerBiker]

This is not good., likely a hardware error

What test does it stall at?

[Boomer1959G]

The hardware diagnostics tool stalls when loading the program before any test can be selected.