wont power on PSU ok

[nalinlee]

My motherboard is Gigabyte B85-HD3 and suddenly pc wont startup.
so i checked psu by shorting two pin and it's worked fine
i also checked power switch and it's work perfectly.
what i did was short the PSU power on wires(green+black) when plugged to the motherboard and pc startup normally and i removed the two pin that i had short and after that pc worked fine
i did some restart and did some bios updates and tried turning on the pc and it all worked
the porblem is
if i disconnect the power line for 1 or 2 minutes i cannot turn on the PC again
i have to short the two pin to power up the pc...
what could be the problem.
mobo is out of warranty

 

[nalinlee]

is there anyone got this error

 

[DSzymborski]

That doesn't mean it's not a PSU problem. What exactly is your PSU?

 

[DRagor]

Are you sure power switch is ok? Tried starting without it, by touching the pins on the motherboard with screwdriver?
How old is motherboard battery? If it is at least 3 years old, it might be good idea to replace it.

 

[nalinlee]

That doesn't mean it's not a PSU problem. What exactly is your PSU?

I tried with 2 different power supply that pulled out from working machines
still the same problem.
anyway i'm using a cheap PSU name as powerlogic

Are you sure power switch is ok? Tried starting without it, by touching the pins on the motherboard with screwdriver?
How old is motherboard battery? If it is at least 3 years old, it might be good idea to replace it.

I tested power switch using a multi meter and switch works perfectly
tried with screwdriver and it won't turn on only method turn on the mobo is Green+black wire trick
CMOS battery had 3.1v when i checked with meter but i will try replacing it (its' 3.5 years old)
I found out that if i keep the power to the pc continuously i can shutdown pc and turn on pc with power button without any issue
if i disconnect the power and pressing the power button it's not going to work. yes i have to short that 2wires to get back power
strange problem

 

[nalinlee]

Problem Solved Changed the PSU