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Question pc restarted automatically

When was the last time that you cleaned it out, dusted out the heatsink, maybe re-pasted the CPU? It could be overheating.

Do you have a "beeper" speaker installed on the mobo? Is it alarming (beeping, continuous tone)?

What are your BIOS settings for temp limit warning and/or shutdown?

Download the (free) program HWMonitor from www.cpuid.com

Check the temps and voltages, both at idle, and then, under load.

Edit: What GPU (video card) do you have? Approx. how old is your system, as far as you've had it. Was it purchased new, or out of used parts?
 
Check Event Viewer, Administrative Events.

Look for errors.

3rd gen CPU / motherboard? could be PSU / motherboard dying.
 
When was the last time that you cleaned it out, dusted out the heatsink, maybe re-pasted the CPU? It could be overheating.

Do you have a "beeper" speaker installed on the mobo? Is it alarming (beeping, continuous tone)?

What are your BIOS settings for temp limit warning and/or shutdown?

Download the (free) program HWMonitor from www.cpuid.com

Check the temps and voltages, both at idle, and then, under load.

Edit: What GPU (video card) do you have? Approx. how old is your system, as far as you've had it. Was it purchased new, or out of used parts?
i am hardcore gamer so have already msi afterburner and hwinfo64 bit there is no temperature problem in games all below 60 always. i clean my pc once in a month so no dust here it is from event log
Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 29-10-2020 10.27.59 AM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (70368744177664),(2)
User: SYSTEM
Computer: DESKTOP-7A0NB
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331c3b3a-2005-44c2-ac5e-77220c37d6b4}" />
<EventID>41</EventID>
<Version>8</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000400000000002</Keywords>
<TimeCreated SystemTime="2020-10-29T04:57:59.0183103Z" />
<EventRecordID>1309</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>DESKTOP-7A0NBH9</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">6</Data>
<Data Name="PowerButtonTimestamp">0</Data>
<Data Name="BootAppStatus">3221225684</Data>
<Data Name="Checkpoint">0</Data>
<Data Name="ConnectedStandbyInProgress">false</Data>
<Data Name="SystemSleepTransitionsToOn">1</Data>
<Data Name="CsEntryScenarioInstanceId">0</Data>
<Data Name="BugcheckInfoFromEFI">false</Data>
<Data Name="CheckpointStatus">0</Data>
<Data Name="CsEntryScenarioInstanceIdV2">0</Data>
<Data Name="LongPowerButtonPressDetected">false</Data>
</EventData>
</Event>
 
Hmm, OK, so temps are probably not the problem. PSU being 9 years old is suspect though. Unless it came with a 10-year warranty and has JPN caps, I would replace it, or at least, try swapping it with a new-ish PSU that is known working, either from a friend's PC, or maybe you can pick one up from a store with a good return policy, if you turn out to not need it, if you know what I mean. But that's my guess, when PSUs get that old, sometimes, they can get flaky.

Edit: PS. If you are as hardcore as you say, having a "spare PSU" around in the wings, is NOT a bad idea. I recommend that any serious computer enthusiast have a "bench PSU" or "spare PSU", that's less than 10 years old itself.
 
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