Solve : No POST screen and high fan speed HP elitebook laptop?

1.	Solve : No POST screen and high fan speed HP elitebook laptop?
Answer» So today morning everything was fine but when i FLASHED a linux distro Pop OS on my system which alredy has a windows 10 working So pop os was flashed as a legacy type and my laptop supports both UEFI and legacy Main PROBLEM was i chosen ESP partition as the boot for linux and an empty partition for a root So after a reboot only pop os SHOWS up as a legacy windows disappeared But the main problem happened is after a multiple reboots My system end up with a black screen no POST no BIOS screen no Only keyboard backlights for 1 SEC. And display backlights for eternity Note display baclights are turning on but no display And i am SURE system is not booting up behind the bars Fan speed boosts to its limit Tried bios recovery option by windows+b method But no luck Can anyone please help me on this

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