error HP

Error Code Red LED flashes 6 times

Pre-video graphics error — problem with integrated or add-in video card configuration.

? What Causes This

Faulty video memory or graphic adapter connectivity issue.

Reseat the graphics card if applicable.
Check monitor connection and disable/uninstall other GPU options via BIOS setup.

Source: page 3 of the official manual

From the manual

This error code appears in: