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