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After turning on my laptop it shows a blank screen and the caps lock and nums lock blink for 7times

HP Recommended
CND5215Q7J
Microsoft Windows 10 (64-bit)

Name of the laptop: HP zbook 15 g2

Serial number:[Private information removed]

after turning on the laptop, screen just goes blank for minutes and the caps lock and the nums lock led flashes for 7times then the fans that blowing hard, I have tried the win+b or v to reset bios but to no avail, I have even tried overheating the laptop to force a shut down and tried to reboot it, to no avail pls I need help

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