PC randomly restarts usually once a day

[vissen]

After the last time my PC was fixed it just started to restart usually once a day, sometimes it didn't happen, rarely twice in one day. It doesn't do much harm, but it still is annoying and it CAN do damage some day. I didn't do anything about it yet, but today is the day im done with this and ask for help.
By the way it just randomly restarts/reboots without a warning or error.

my specs (yep, not only shit but poorly built):
CPU: AMD FX 6100
graphics: (Palit) Nvidia GeForce GTX 750 Ti
memory: (unknown brand) 8GB (2x4GB) DDR3 1333 MHz
motherboard: ASUS M5A78L-M LX3
PSU: [strike]500W (probably enough, also "unknown" brand, although I know the brand, but it's from my country [Poland] so you wont know it)[/strike] actually it's "Modecom premium 500"

 

[Tad0098]

have you tried going to advanced system setting--->start up & recovery---> un check automatically restart?

 

[DSzymborski]

Really want the PSU information. In 20 years, I've think I've seen just a single PSU from a small brand localized in a single country that wasn't completely garbage (this weird Dubai PSU which name I forget some years ago that was shockingly good). Random restarts without blue screens tend to be temperatures or power delivery.

 

[vissen]

Really want the PSU information. In 20 years, I've think I've seen just a single PSU from a small brand localized in a single country that wasn't completely garbage (this weird Dubai PSU which name I forget some years ago that was shockingly good). Random restarts without blue screens tend to be temperatures or power delivery.

about the PSU, thread is now updated. Also, the temps are all ok, usually only goes up to 62C even if I play long.

 

[vissen]

have you tried going to advanced system setting--->start up & recovery---> un check automatically restart?

I've done it now, I'll tell if the problem is still there

 

[vissen]

have you tried going to advanced system setting--->start up & recovery---> un check automatically restart?

Yeah... it didn't work

 

[DSzymborski]

What stands out about that PSU is just how old it must be. Passive power factor correction, ATX 2.2 (eclipsed more than a decade ago), and those weak, multiple +12V rails just screams something that was manufactured in 2006 from low-quality parts. Does this 750ti need a supplementary connector?

Generally speaking, I've seen replacing the extremely marginal PSU very frequently fix these issues. But they also frequently don't; a lousy power supply is something you have to remove from the equation at the start for a problem like this, but it's not always sufficient to truly get at the issue. If your temperatures are fine, borrowing or buying a better quality PSU would be the next place I go.

 

[vissen]

What stands out about that PSU is just how old it must be. Passive power factor correction, ATX 2.2 (eclipsed more than a decade ago), and those weak, multiple +12V rails just screams something that was manufactured in 2006 from low-quality parts. Does this 750ti need a supplementary connector?

Generally speaking, I've seen replacing the extremely marginal PSU very frequently fix these issues. But they also frequently don't; a lousy power supply is something you have to remove from the equation at the start for a problem like this, but it's not always sufficient to truly get at the issue. If your temperatures are fine, borrowing or buying a better quality PSU would be the next place I go.

No it doesn't need a supplementary connector, I think. You cant connect any pins to it, so I guess it doesnt need it.
Also, my USB ports keep disconnecting. Yeah ports. few months ago both my keyboard and mouse started to disconnect randomly. I had to manually reconnect cables to make them work again. Now my keyboard doesn't disconnect but my mouse still does. Is that a problem with the motherboard, firmware, PSU or OS? Because I don't suspect the mouse to be broken.