Reboot at startup (Metal Gear Solid 5: The Phantom Pain)

I am looking for help, the situation is as follows at the start of the game as soon as the screen turns black and rectangles blink in the corner, all this lasts for half a second, then the computer is rebooted / turned off and turned on. I am 99 percent sure that the power supply is dying, and a little later I will change it, but the fact is that the metal gear reboots the computer instantly, the dragon age immediately as soon as the save is finished loading, but for example the witcher3 (which loads the percent and video etc. works more without problems) and some other games also work without rebooting.
so I would like to clarify, maybe someone knows what such discrimination can be caused, maybe someone knows, or supposes, for example, metal gear uses this and that (direct x17 or some other libraries) or cause something that the witcher does not use. only a kernel error is noted in the log. I am weak and stupid in electricity voltages, to put it mildly, because someone can tell you the possible reasons, ways to identify solutions. I understand that the topic is not really about metal weight, but
I have an old iron connected with it , of course, but it pulls and pulled before
Spoiler ------------------
System Information
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Operating System: Windows 8.1 Pro with Media Center 64-bit (6.3, Build 9600) (9600.winblue_gdr.140723-2018)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: P5KC
BIOS: BIOS Date: 06/25/08 18:03:13 Ver: 08.00.12
Processor: Intel (R) Core (TM) 2 Duo CPU E8200 @ 2.66GHz (2 CPUs) , ~ 2.7GHz
Memory: 4096MB RAM
Available OS Memory: 4096MB RAM
Page File: 2035MB used, 8060MB available
Windows Dir: C: Windows
DirectX Version: DirectX 11

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Display Devices
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Card name: AMD Radeon HD 6800 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x6738)
DAC type: Internal DAC (400MHz)
Device Type: Full Device

Display Memory: 2807 MB
Dedicated Memory: 1015 MB
Shared Memory: 1792 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: SyncMaster
Monitor Id: SAM030D
Native Mode: 1680 x 1050 (p) (59.883Hz)
Output Type: DVI
Driver Name:


dva, atiumd6a.cap, atitmm64.dll
Driver File Version: 8.17.0010.1404 (English)
Driver Version: 15.201.1151.0
DDI Version: 11
Feature Levels: 11.0,10.1,10.0,9.3,9.2,9.1
Driver Model: WDDM 1.3
Graphics Preemption: DMA
Compute Preemption: DMA
Miracast: Not Supported
Hybrid Graphics GPU: Not Supported
Power P-states: Not Supported
Driver Attributes: Final Retail
Driver Date / Size: 9/9/2015 03:49:12, 1458144 bytes
WHQL Logo'd: No
WHQL Date Stamp: None

Disk & DVD / CD-ROM Drives
------------- -----------
Drive: C:
Free Space: 27.1 GB
Total Space: 55.2 GB
File System: NTFS
Model: Hitachi HDP725032GLA360 ATA Device

Drive: D:
Free Space: 33.1 GB
Total Space: 250.0 GB
File System: NTFS
Model: Hitachi HDP725032GLA360 ATA Device

--------------
System Devices
--------------
Name: Intel (R) ICH9 Family USB Universal Host -controller - 2934

Name: JMB36X Standard Dual Channel PCIE IDE Controller
20 bytes

Name: PCI Express 5 Root Port Intel (R) ICH9 - 2948

Name: PCI Express 1 Root Port Intel (R) ICH9 - 2940

Driver: C: Windows system32 DRIVERS pci.sys, 6.03.9600.17238 (Russian ), 7/24/2014 23:28:35, 280384 bytes

Name: Intel (R) ICH9 Family USB Universal Host Controller - 2937


Name: Intel (R) ICH9 Family 2 port Serial ATA Storage Controller 2 - 2926
s

Name: AMD Radeon HD 6800 Series


Name: Intel (R) ICH9 Family 2 port Serial ATA Storage Controller 1 - 2921

Name: Intel (R) G33 / G31 / P35 / P31 Express Chipset Processor to I / O - 29C0
Dev
PSU noname 450 watt