system goes off when i turn it on

ilphma

Reputable
Aug 4, 2014
3
0
4,510
hi

when i turn on my computer,
1. it turns on first
2. but after a second it turns off
3. and after about 4 sec, automatically turns on again and works normally!

i don't know why it happens but two days ago:
i tried to maximum my cpu fan speed, so i gone to bios and changed it, now i restarted bios to default in case of any unknown change, but the problem is still there.

and the system case was open to see the speed visually, but i didn't change any cable or other things (at least on purpose).
and i installed Easy Tune6 too with some other programs such as Intel® Smart Connect Technology.
and used a new keyboard.

this four are all the changes which happend, whats the problem do you think?

thanks.
 

ilphma

Reputable
Aug 4, 2014
3
0
4,510
i justed checked the main cable, but i think if any thing was wrong with cables, it should goes off and never on again, but it came back to on and works normally!
 

ilphma

Reputable
Aug 4, 2014
3
0
4,510
i did a bios reset with taking the cmos battery off, so i think it shouldn't be about bios changes.
then i unplugged every thing, except the cpu, rams, main power cable and cpu power cable, and the front power cable. the problem didn't solve!

what do you think? power is problem or mother board or any thing else?