PC reboots on startup

[souped_up_subaru]

My PC has suddenly started to reboot every time I boot up Windows.
 

It was fine  until now, but when I switch it on, it appears to be laggy and reboots.

 

Any help would be greatly appreciated! 

 

Edit: CPU temps are currently about 40 degrees. Max 67 degrees.

 

Edit 2: Windows Memory Diagnostic Tool is clean.

 

Edit 3: Ran CHKDSK, found no problems.

Edited March 30, 2024 by souped_up_subaru

[Haswellx86]

@souped_up_subaru

 

What do you mean by reboot? Like you go into Windows and suddenly the restarting dialog pops up?

[souped_up_subaru]

4 minutes ago, Gat Pelsinger said:

@souped_up_subaru

 

What do you mean by reboot? Like you go into Windows and suddenly the restarting dialog pops up?

It's after Windows has started, it's okay for a sec, then it lags, then it goes black, and I see the screen will say "restarting" or something like a loading circle- that type of thing

[Haswellx86]

@souped_up_subaru

 

Tell PC specs. Is it low-end? You should try booting into safe mode through msconfig.

[souped_up_subaru]

4 minutes ago, Gat Pelsinger said:

@souped_up_subaru

 

Tell PC specs. Is it low-end? You should try booting into safe mode through msconfig.

Here. With a GTX 1050 Ti.

 

I'll try safe mode.

[souped_up_subaru]

11 minutes ago, Gat Pelsinger said:

@souped_up_subaru

 

Tell PC specs. Is it low-end? You should try booting into safe mode through msconfig.

I just did a clean boot instead but everything seems to be ok this time