Visible impact damage makes the answer clearer, but an undamaged black display can have several causes.
Signs of panel damage
Cracks, ink-like black patches, coloured vertical lines, distorted areas and image changes when the lid moves commonly point toward the display or cable.
External monitor test
If an external monitor works, the fault is more likely within the laptop display path, but this does not identify the panel by itself. A failed backlight, cable or connector can produce similar symptoms.
No image anywhere
If the laptop shows no image internally or externally and does not complete startup, memory, BIOS, power or motherboard diagnosis may be needed.
Need model-specific advice? Contact our Benowa workshop with the full HP product number and fault description. For physical damage, include clear photos.