PC having very weird problem

[gungun]

some days ago i updated my windows 10 and after successful update of windows i shutdown my machine and went to sleep. next morning i try to start my pc so i press the button, but strangely my pc doesn't boot. i re plug every thing from switch board to computer to ram everything but nothings happened. i keep trying it switch on and trying to figure out what is happening to my pc . also search on internet but found nothing.  my pc also doesn't boot (no response at all). but suddenly after some hour pc switch on and boot by itself (power was on) all the lights glow up but no response on screen i switch off the pc directly from switch board and my pc get turn off following by three or four beep with red light. i then turn on my pc and viola! it turns on with out any problem. i did my work on computer and shutdown the machine.

 

next day i switch on my pc but again it doesn't boot no response. same problem!  after some hour i again press the button and that idiot pc turn on! i mean wtf!

 

i noticed one thing every time. the time displaying on pc is wrong . my windows was set to automatic detect and correct date and time. but this time it doesn't detect and correct the time SEEMS LIKE MY BIOS BATTER IS DEAD. but bios battery has nothing to do with the booting of pc! right

 

Whatever i replace the bios battery with new one. and from next day the pc started working normal. 

 

but after 2 days SAME PROBLEM. again showing wrong time after turn on by itself after hours? wtf

 

again changed the battery and PROBLEM GET RESOLVED. 

 

after some days same problem occurs. again i replaced the battery and viola!

 

now currently running through same problem. today it started after many hour after turning on switch.

 

WHAT IS HAPPENING MAN? any one having such problem or know how to resolve it. 

 

i already uploaded the specs please check if you want. thanks

My computer specs.pdf

[Skiiwee29]

Try "shorting" your motherboard power if you dont have an onboard power button. You can take the power pin out of and touch them briefly with a flathead screw driver to see if it will boot. If this doesnt work, then I think your PSU might be faulty.