For diagnostics within Windows (when PC boots but is unstable).
For PCs that cannot boot to OS or UEFI (no F2 access). hp pc hardware diagnostic
HP provides a pre-boot diagnostic environment that runs independently of the OS. For diagnostics within Windows (when PC boots but
HP PC Hardware Diagnostic is available on HP computers, either pre-installed or through the HP Support Assistant. Users can also download the tool from the HP website. hp pc hardware diagnostic