What are the specs on your 7710?
Does the machine have a dedicated GPU installed?
If the answer is no, that could be your issue.
If the answer is yes, What GPU is installed?

Thank you for your comment, JamesJAB1!

* Above all, the pre-boot test all passed without failure.

the main specs are :

[Precision 7710]

BIOS ver : 1.20.3
BIOS date : 2/17/20

Processor :
Intel® Xeon® E3-1535M v5 (Quad Core 2.90GHz, 3.80GHz Turbo, 8MB 45W, w/Intel HD Graphics P 530), MPWS

Memory :
16GB ECC memory + 32GB non-ECC memory = 48GB
ChannelA-DIMM0 : 8,192.0MB
ChannelB-DIMM0 : 16,384.0MB
ChannelB-DIMM1 : 8,192.0MB
ChannelA-DIMM1 : 16,384.0MB

SSD :
Samsung SSD 970 PRO 1TB

Display Adapter :
NVIDIA Quadro M3000M

* Is there any possibility of CPU(Xeon)'s internal graphic failure ?

I would question if the mismatched RAM is not agreeing with the Intel graphics.  Try pulling the 16GB of ECC RAM and check if the issue continues.

On a side note, I have never liked using switchable graphics on laptops.  (My Precision 7710 is running just the dedicated Nvidia GPU and I have no issues)

Try turning switchable graphics off.  This will force the Quadro GPU to handle all of the screens internal and external. (As far as Windows sees, the Intel graphics do not exist)

There is also a checkbox in the bios that will direct all external displays directly to the dedicated GPU. (With this option the Intel Graphics power the laptop display and the Quadro powers the external monitors.

I appreciate your kindness and detailed tech tips, JamesJAB1!

The following is the process to the solution in my case.

- the following -
update(2020-07-19 AM 12:28:11)
1) disable automatic driver updates windows 10 in 'gpedit.msc'

2) in the 'Device Manager' > View > Show hidden devices
pre-installed hidden p530 & m300m driver > Uninstalled

3) in the video section of BIOS > All three like 'switchable, dock enable, dedicated' are checked 'On'

4) windows logged on
as Intel p530 driver version was 26.20.100.7262 at that time
but windows rebooting failed with black screen+no key response+fan noise
so shutdown forcibly

5) windows logged on again
..nvidia video driver manually updated in 'Device Manager'
as nvidia M3000M driver version is '26.21.14.4283'
but windows rebooting still failed with black screen+no key response+fan noise
so shutdown forcibly

6) windows logged on again
Intel p530 driver manually updated in the following URL
https://www.intel.co.kr/content/www/kr/ko/support/intel-driver-support-assistant.html
https://downloadcenter.intel.com/download/29674
its version is '27.20.100.8336'

windows rebooting was okay only once after driver-update,
and windows rebooting failed with black screen+no key response+fan noise
so shutdown forcibly

7) windows logged on > powercfg /hibernate on
..to show 'Turn on fast startup' option in power.cpl

 8 ) power.cpl
'Choose what the power buttons do'
> uncheck 'Turn on fast startup'
> windows rebooting was okay only once after this action
and windows rebooting failed with black screen+no key response+fan noise

9) 'BIOS cell battery. I took it out for about 10 seconds and then put it back in'
..system environment changed, so not booting normally like before and repairing failed.
> system resetting(re-installing windows 10) by itself for about an hour.

!!! AND EVENTUALLY !!!
* New Intel driver updated and system rebooting/shutdown all okay (solved, I guess)
intel p530 ver. 27.20.100.8425
27.20.100.8336(before)

nvidia M3000M ver. 23.21.13.8908
26.21.14.4283(before)

..Good luck with you!