Definitely not caused by lack of power.
Your DxDiag output is a bit short, it doesn't show the video and sound drivers, but just to make sure: Do you have your video card HDMI sound available? If you don't use your monitor speakers, you'd be better off by first disabling the HDMI sound in Device Manager and then uninstall the sound drivers of your video card.
Also, although Win10 does a decent job with especially Intel drivers, check that your motherboard drivers are up to date. Any yellow triangles with exclamation marks in the Device manager can mean trouble.
------------
DxDiag Notes
------------
Display Tab 1: No problems found.
Display Tab 2: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Sound Tab 3: No problems found.
Sound Tab 4: No problems found.
Sound Tab 5: No problems found.
Sound Tab 6: No problems found.
Input Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)
---------------
Display Devices
---------------
Card name: NVIDIA GeForce RTX 2080 SUPER
Manufacturer: NVIDIA
Chip type: NVIDIA GeForce RTX 2080 SUPER
DAC type: Integrated RAMDAC
Device Type: Full Device (POST)
Device Key: Enum\PCI\VEN_10DE&DEV_1E81&SUBSYS_372D1462&REV_A1
Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_ENUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 24362 MB
Dedicated Memory: 8010 MB
Shared Memory: 16352 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
HDR Support: Not Supported
Display Topology: Extend
Display Color Space: DXGI_COLOR_SPACE_RGB_FULL_G22
_NONE_P709
Color Primaries: Red(0.641602,0.334961), Green(0.291016,0.635742), Blue(0.153320,0.042969), White Point(0.313477,0.329102)
Display Luminance: Min Luminance = 0.500000, Max Luminance = 270.000000, MaxFullFrameLuminance = 270.000000
Monitor Name: Generic PnP Monitor
Monitor Model: 2752
Monitor Id: AOC2752
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: HDMI
Monitor Capabilities: HDR Not Supported
Display Pixel Format: DISPLAYCONFIG_PIXELFORMAT_32B
PP
Advanced Color: Not Supported
Driver Name: C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll
Driver File Version: 31.00.0015.1694 (English)
Driver Version: 31.0.15.1694
DDI Version: 12
Feature Levels: 12_1,12_0,11_1,11_0,10_1,10_0,9_3,9_2,9_1
Driver Model: WDDM 2.7
Hardware Scheduling: Supported:True Enabled:False
Graphics Preemption: Pixel
Compute Preemption: Dispatch
Miracast: Not Supported
Detachable GPU: No
Hybrid Graphics GPU: Not Supported
Power P-states: Not Supported
Virtualization: Paravirtualization
Block List: No Blocks
Catalog Attributes: Universal:False Declarative:True
Driver Attributes: Final Retail
Driver Date/Size: 21/07/2022 10:30:00 AM, 1130008 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
Device Identifier: {D7B71E3E-5DC1-11CF-4C71-22170EC2D235}
Vendor ID: 0x10DE
Device ID: 0x1E81
SubSys ID: 0x372D1462
Revision ID: 0x00A1
Driver Strong Name: oem23.inf:0f066de3c6f18dd7:Section022:31.0.15.1694:pci\ven_10de&dev_1e81&subsys_372d1462
Rank Of Driver: 00CF0001
D3D9 Overlay: Not Supported
DXVA-HD: Supported
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
MPO MaxPlanes: 4
MPO Caps: RGB,YUV,BILINEAR,HIGH_FILTER,STRETCH_YUV,STRETCH_RGB,IMMEDIATE,HDR (MPO3)
MPO Stretch: 10.000X - 0.500X
MPO Media Hints: resizing, colorspace Conversion
MPO Formats: NV12,YUY2,R16G16B16A16_FLOAT,R10G10B10A2_UNORM,R8G8B8A8_UNORM,B8G8R8A8_UNORM
PanelFitter Caps: RGB,YUV,BILINEAR,HIGH_FILTER,STRETCH_YUV,STRETCH_RGB,IMMEDIATE,HDR (MPO3)
PanelFitter Stretch: 10.000X - 0.500X
Card name: NVIDIA GeForce RTX 2080 SUPER
Manufacturer: NVIDIA
Chip type: NVIDIA GeForce RTX 2080 SUPER
DAC type: Integrated RAMDAC
Device Type: Full Device (POST)
Device Key: Enum\PCI\VEN_10DE&DEV_1E81&SUBSYS_372D1462&REV_A1
Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_ENUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 24362 MB
Dedicated Memory: 8010 MB
Shared Memory: 16352 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
HDR Support: Not Supported
Display Topology: Extend
Display Color Space: DXGI_COLOR_SPACE_RGB_FULL_G22
_NONE_P709
Color Primaries: Red(0.652344,0.330078), Green(0.221680,0.680664), Blue(0.148438,0.053711), White Point(0.309570,0.330078)
Display Luminance: Min Luminance = 0.500000, Max Luminance = 270.000000, MaxFullFrameLuminance = 270.000000
Monitor Name: Generic PnP Monitor
Monitor Model: W2402S
Monitor Id: KTC2400
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: DVI
Monitor Capabilities: HDR Not Supported
Display Pixel Format: DISPLAYCONFIG_PIXELFORMAT_32B
PP
Advanced Color: Not Supported
Driver Name: C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvmdi.inf_amd64_1f4f13287900d9b3\nvldumdx.dll
Driver File Version: 31.00.0015.1694 (English)
Driver Version: 31.0.15.1694
DDI Version: 12
Feature Levels: 12_1,12_0,11_1,11_0,10_1,10_0,9_3,9_2,9_1
Driver Model: WDDM 2.7
Hardware Scheduling: Supported:True Enabled:False
Graphics Preemption: Pixel
Compute Preemption: Dispatch
Miracast: Not Supported
Detachable GPU: No
Hybrid Graphics GPU: Not Supported
Power P-states: Not Supported
Virtualization: Paravirtualization
Block List: No Blocks
Catalog Attributes: Universal:False Declarative:True
Driver Attributes: Final Retail
Driver Date/Size: 21/07/2022 10:30:00 AM, 1130008 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
Device Identifier: {D7B71E3E-5DC1-11CF-4C71-22170EC2D235}
Vendor ID: 0x10DE
Device ID: 0x1E81
SubSys ID: 0x372D1462
Revision ID: 0x00A1
Driver Strong Name: oem23.inf:0f066de3c6f18dd7:Section022:31.0.15.1694:pci\ven_10de&dev_1e81&subsys_372d1462
Rank Of Driver: 00CF0001