I have an HP Envy x360 15m-dr laptop which sometimes beeps 8 times on startup and sometimes gets no beeps at all (both with no picture).
Power button light comes on, fans spin and stop after a few seconds, then screen stays black with no picture. If the machine decides to beep 8 times, it shuts off immediately after. According to what I could find, 8 beeps was corrupted BIOS.
Made backup of original BIOS (attached). Attempted to flash BIOS with extracted bin file from HP BIOS update. Screen showed "Updating boot block", rebooted and immediately back to 8 beeps and...
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