Keyboard and mouse are off leaving monitor as in a Frozen state

My graphic card is GeForce GTX 750 it is based on the first generation of the Maxwell architecture, namely the GM107 chip..
I used FurMark testing and ran it at 100% for a while until it was approaching 80C. It ran perfectly.

I don't know how to disabling Nvidia running only on Intel in-built? I have a Ryzen 7 1700 8 core CPU and has no built in graphics. If you are refering to my CPU.

I find Edge to work better for processing sales invoices.

After the confusion on my part I totally forgot CPU are now available with Graphics built in. Not my choice of CPU.

The answer to your question is I only use AMD CPU with no graphics built in.

So could this now mean freezing problem may be something on Zorin side of software?

Actually... This response made me consider that it is on the AMD side.
So, you have AMD Graphics and Nvidia graphics?
If you have the AMD-gpu-pro drivers installed:

sudo amdgpu-pro-uninstall

sudo apt-get install --reinstall xserver-xorg-video-radeon

sudo apt install xserver-xorg

sudo update-initramfs -u -k all

I have no AMD Graphics. Just a Nvidia graphics card.
I ran sudo's
ezorb@ezorb-AX370-Gaming-5:~$ sudo amdgpu-pro-uninstall
[sudo] password for ezorb:
sudo: amdgpu-pro-uninstall: command not found
ezorb@ezorb-AX370-Gaming-5:~$ sudo apt-get install --reinstall xserver-xorg-video-radeon
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
chromium-codecs-ffmpeg-extra gstreamer1.0-vaapi heif-gdk-pixbuf
libfwupdplugin1 libnvidia-cfg1-470 libnvidia-common-470 libnvidia-decode-470
libnvidia-encode-470 libnvidia-extra-470 libnvidia-fbc1-470 libnvidia-gl-470
libnvidia-ifr1-470 libpython2-stdlib:i386 libpython2.7-minimal:i386
libpython2.7-stdlib:i386 libreadline8:i386 libssl1.1:i386 libx11-xcb1:i386
libxnvctrl0 nvidia-compute-utils-470 nvidia-settings nvidia-utils-470
screen-resolution-extra xserver-xorg-video-nvidia-470
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 14 not upgraded.
Need to get 153 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 Index of /ubuntu focal/main amd64 xserver-xorg-video-radeon amd64 1:19.1.0-1 [153 kB]
Fetched 153 kB in 1s (237 kB/s)
(Reading database ... 285841 files and directories currently installed.)
Preparing to unpack .../xserver-xorg-video-radeon_1%3a19.1.0-1_amd64.deb ...
Unpacking xserver-xorg-video-radeon (1:19.1.0-1) over (1:19.1.0-1) ...
Setting up xserver-xorg-video-radeon (1:19.1.0-1) ...
Processing triggers for man-db (2.9.1-1) ...
ezorb@ezorb-AX370-Gaming-5:~$ sudo apt install xserver-xorg
Reading package lists... Done
Building dependency tree
Reading state information... Done
xserver-xorg is already the newest version (1:7.7+19ubuntu14).
The following packages were automatically installed and are no longer required:
chromium-codecs-ffmpeg-extra gstreamer1.0-vaapi heif-gdk-pixbuf
libfwupdplugin1 libnvidia-cfg1-470 libnvidia-common-470 libnvidia-decode-470
libnvidia-encode-470 libnvidia-extra-470 libnvidia-fbc1-470 libnvidia-gl-470
libnvidia-ifr1-470 libpython2-stdlib:i386 libpython2.7-minimal:i386
libpython2.7-stdlib:i386 libreadline8:i386 libssl1.1:i386 libx11-xcb1:i386
libxnvctrl0 nvidia-compute-utils-470 nvidia-settings nvidia-utils-470
screen-resolution-extra xserver-xorg-video-nvidia-470
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 14 not upgraded.
ezorb@ezorb-AX370-Gaming-5:~$

What did this do?

I misunderstood your above post, sorry.
-sigh-

NO AMD Graphics card, just the CPU.
Nvidia Graphics.
Please undo my suggestion:

sudo apt-get remove --purge xserver-xorg-video-radeon

Then:

sudo apt ubuntu-drivers install

sudo apt clean && sudo apt autoremove

This is just to ensure that you have operating Graphics...

Had error on 2nd sudo:
ezorb@ezorb-AX370-Gaming-5:~$ sudo apt ubuntu-drivers install
E: Invalid operation ubuntu-drivers

I won't even use built in graphs on MB. I want it where individual components are installed lot less future problems.

Now what next?

I was typing habitually and in too much of a hurry...

sudo ubuntu-drivers install

All of the sudo have been run. Now where are we on the Locking problem. Can it be in Zorin Core Software?

Have you checked modesetting?

Never heard of this before. Know nothing about CUDA. Do you know how to open the control panel or where it is located?
This must have something to do with playing games and HDMI TV. I don't play games>

I am not sure what Control Panel you are referring to... The suggestion in the link above does not reference a Control Panel.

I have no clue to what it is they are talking about.
I tried to run "grep nvidia" the green part and said " no such file"
Need to hold my hand and show/tell me what to do.

Observation: Reading the exchange of posts above, I think @Aravision's link (Keyboard and mouse are off leaving monitor as in a Frozen state - #69 by Aravisian) to the Nvidia Forum was simply pointing you to the modesetting item (2nd post there by generix), not CUDA Toolkit linked within the first post there.

I may have misunderstood myself, so maybe @Aravisian can clarify when he is available.

You understood exactly.
This post:

What is it that I am to do?
How do you create "/etc/X11/xorg.conf Section "Device" Identifier "Aspeed" Driver "modesetting" BusID "PCI:67:0:0"
Are you sure my Geforce GTX 750 has anything to do with the above? I do not have the Geforce GTX 750ti model.
Looks like if it was going to lock up it would have done it under the stress test.

I am not sure, as Nvidia is pretty complex.
Nvidia has had a lot of ups and downs in its relationship with Linux.
And I am not sure what difference there is between the 750 and 750ti
However, attempting the above solution is harmless if it doesn't work and can be helpful if it does.

Create /etc/X11/xorg.conf:
Open terminal
Run

sudo -i

Launch the Sudo elevated file manager
Zorin Core:

nautilus

Zorin Lite:

thunar

In Core (nautilus) navigate to "other locations > computer"
Then to /etc directory in root. Then to X11 directory inside of /etc
In Lite (thunar), hit the up arrow on the toolbar twice. Navigate to /etc/X11/

Right click an open area in the desktop and select the option to create a new Document.
Name it: xorg.conf
In the new xorg.conf document, paste the following:

Section "Device"
  Identifier "Aspeed"
  Driver "modesetting"
  BusID "PCI:67:0:0"
EndSection

Save the document with the save button.

Next, the post says to find the next document using the terminal.
Close the above File Manager and Terminal and Text editor.
Open a new terminal and run

grep nvidia /etc/modprobe.d/* /lib/modprobe.d/*

Look for the line that has nvidia-drm-modeset=1
On mine it is
/lib/modprobe.d/nvidia-kms.conf:options nvidia-drm modeset=1

The path is /lib/modprobe.d and the file is nvidia-kms.conf

S, you can run:

sudo nano /lib/modprobe.d/nvidia-kms.conf

Arrow key down and change the 1 value to 0

Tap ctrl+x to exit. Then the y key to say yes to save. Then the enter key to save the current configuration.
The terminal will return to normal appearnace. Now, run

sudo update-initramfs -u

When I run sudo -1 I get: ~#
In Nautilus inside root only have "snap" no other folders.

In Thunar get all the way to: /ect/X11 after right click Create Document is greyed out.
Am I doing something wrong?

sudo-space-minus sign-letter i

sudo -i

Sorry typo I did use i, I copy paste what you had.

Oh, in that case - the terminal elevated to Root.

Navigate to
"Other Locations" in the left pane
Then in the Right pane, select "Computer"