Computer is shutting down randomly

ICIT2LOL said:

Ok I don't know what video that was but the black is always to black as you found.

That green lead is a pic that can be sorted to a black pin because that is the power on switch connections?

Now wanting you to play around with any pSU's unless you are fairly savvy with them because there are parts - usually the large capacitors in them that hold a high voltage charge very similar to a heart defibrillator and yes it will have the same effect on you as one.

In nutshell defibs are used to actually stop all electrical activity in the heart in the hope that it will start beating in a normal rhythm because a lot of heart attacks are caused when the heart starts to beat in a rhythm that is not conducive to life. . I know this because I am an RN of 44+ years so please DO not mess with these devices unless you know what you are doing.

I do have an old PSU set up to test fans etc using a bridge connection between the black and green pins but again unless you research it really well DO NOT try to use one for anything without the knowledge needed.

NOw backing up - the blue lead is actually the -12v (negative) pin and it's importance is not really that relevant these days - I stand to be corrected of course.

The colours that are important are yellow +12v (positive) red +5v and orange +3.3v

Now those readings have to be with +/- 5% of the required voltage any more or less can cause damage to components though most modern PSU's have circuitry (POWER_GOOD +5v grey cable pin) that will not allow a machine to boot or even start for that matter if the +5 does not appear at the grey pin when powering up the machine.
See this table
Limits +/- (minimum - correct - maximum)
12v1 = 11.4 - 12 - 12.6v
12v2 = 11.4 - 12- 12.6v
5v = 4.75 – 5 - 5.25v
3.3v = 3.135 – 3 – 3.465v
-12v = -10.80 - -12 - -13.20v
+5VSB = 4.75 – 5 - 5.25v
The Power good signal voltage at pin 8 on the 24 pin plug (grey cable) should be the same as the 5v rail reading/s

But well done for getting that done as it is in my mind better than getting reading from softwares that can be often off mark personally I don't really rely too much on the BIOS but others may disagree.

Ok thanks a lot.
I did not understand very well.

Is my PSU good or damaged?
what should I do now?

Is it actually just shutting down randomly or actually crashing to black screen and shutting down? I ask because I had this recently and it was when the graphics was overloaded (rubbish graphics driver and too much stuff on my system). It's stopped doing it since I did a clean install. But had to install the graphics driver to do the clean install. Might be my graphics card as well. Just a thought, but I'm not one of the experts

hazel123 said:

Is it actually just shutting down randomly or actually crashing to black screen and shutting down? I ask because I had this recently and it was when the graphics was overloaded (rubbish graphics driver and too much stuff on my system). It's stopped doing it since I did a clean install. But had to install the graphics driver to do the clean install. Might be my graphics card as well. Just a thought, but I'm not one of the experts

Computer is shuting down randomly, and then it reboots. Sometimes it will stay off, sometimes it will loop.
When it crashes and stays offf, when I go to turn it on, sometimes it will loop no even getting to the BIOS.
I do not have dedicated graphics card

I am ready to keep on troubleshooting peoeple, any help appreciated

Thanks a lot

Only time I've had something like that, it was a virus but could but a lot of other things as well - and the more expert people will know. I don't quite understand your set up. This might be a silly question but have you run malwarebytes antimalware?

amoretam said:

I am ready to keep on troubleshooting people, any help appreciated
Thanks a lot

Can you post a screenshot as discussed in post #15

Just remembered - another time I had that was after upgrading bios on a machine.

johnhoh said:

Can you post a screenshot as discussed in post #15

cannot boot computer to Windows,
and if I boot to windows, it will shutt off before I am done with that.

thanks