Laptop does not boot to Windows.

[JamesSP]

When I switch on the Power I get a blank screen except for a small blue dialogue box asking me to:

"Enter Administrator or Power-On Password"

However, when I enter my usual Power On Password I get an Invalid password message! 

[WAWood]

@JamesSP 

If your PC reset your password on you, we can not help in that because we have no access to either the original or the new password.

We are not permitted to assist in resetting passwords due to HP Policy.
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For Admin password resets, you have to contact your regional HP Customer Support location directly for assistance.
https://support.hp.com/us-en/contact-hp?openCLC=true