PC won't start up

[galakt1c]

Yesterday my PC was working fine, I decided it was time to go to bed so I shut it down and turned the PSU switch off.

Today I pressed the power button on my case and didn't do anything, no beeps, no fans spinning, nothing. I opened the case and the SB_PWR LED was on as well as the ethernet lights. I turned the switch off and on of the PSU, pressed the power button and nothing. I start getting worried.

 

Maybe the power button on my case is faulty, so I try to start jump it with a flat screwdriver to no avail. PC is not making any noises and no LEDs but the SB_PWR are on. So i proceed to tedt bench it. I disconnect everything but the CPU, PSU and single RAM slot. Nothing.

 

I don't know what to do now or how in the world is this not starting up. I have an ASUS H87-M PLUS mobo with an i5-4440 an EVGA 500W 80+ and a Kingston HyperX FURY DDR3 8GB RAM.

 

I think my motherboard is dead, but curious as the SB_PWR LED is still on. Perhaps it has nothing to do with it and need to buy a replacement. I'm hoping maybe I'm just dumb and am missing something obvious. Can someone help?

 

Thank you.

[Biggerboot]

No post or spinning fans but the motherboard light is still on... when you tried the jump start did you do it with the board outside the case?  Slight chance it could a short with the case, so I would try that next.  Also make sure you're booting cold turkey (the minimum you need to post: cpu/1 dimm).

 

After that I think it's process of elimination.  Try a different psu if you have one lying around.  After that it's time to replace the motherboard.

[TheGlenlivet]

Pull CMOS battery too.

[EsaT]

Trying with different PSU would be one thing.

If you're enthusiast user with lots of power on hours for PC, standard cheap PSU could be reaching its design goal.

And suspect that PSU is standard cheap one, just with EVGA's sticker on top.

 

That LED tells only that 5V standby is enough to light up LED, but not high enough to burn it.

That leaves lots of room for out of spec voltage or huge ripple.

 

What happens when you connect those pins of power on switch, is you telling electronics on motherboard (powered by that 5Vsb) to tell PSU to start by pulling green wire down to ground potential (black) in main 24 pin cable.

And that circuitry needs correct and stable voltage to function.

Already checking 5Vsb output with multimeter could tell something.

[galakt1c]

On 8/16/2018 at 4:22 PM, Biggerboot said:

No post or spinning fans but the motherboard light is still on... when you tried the jump start did you do it with the board outside the case?  Slight chance it could a short with the case, so I would try that next.  Also make sure you're booting cold turkey (the minimum you need to post: cpu/1 dimm).

 

After that I think it's process of elimination.  Try a different psu if you have one lying around.  After that it's time to replace the motherboard.

I tried it and had 1 different thing happen, the cpu fan moved up slightly. Sadly I tried with a different PSU and the same thing occurred.

 

Think the motherboard is dead and have to buy a new one :sigh:

[galakt1c]

On 8/16/2018 at 4:39 PM, EsaT said:

Trying with different PSU would be one thing.

If you're enthusiast user with lots of power on hours for PC, standard cheap PSU could be reaching its design goal.

And suspect that PSU is standard cheap one, just with EVGA's sticker on top.

 

That LED tells only that 5V standby is enough to light up LED, but not high enough to burn it.

That leaves lots of room for out of spec voltage or huge ripple.

 

What happens when you connect those pins of power on switch, is you telling electronics on motherboard (powered by that 5Vsb) to tell PSU to start by pulling green wire down to ground potential (black) in main 24 pin cable.

And that circuitry needs correct and stable voltage to function.

Already checking 5Vsb output with multimeter could tell something.

Unfortunately I don't have a multimeter. I tried with a different PSU but it only moves the cpu fan slightly but it doesn't turn on.

[TacticlTwinkie]

5 minutes ago, galakt1c said:

Unfortunately I don't have a multimeter. I tried with a different PSU but it only moves the cpu fan slightly but it doesn't turn on.

Did you try clearing the CMOS?

[galakt1c]

22 hours ago, TacticlTwinkie said:

Did you try clearing the CMOS?

Yes, I forgot to mention it. I even removed the battery, then swithced the jumper but the result was the same CPU fan would just spim very little and nothing else

[galakt1c]

Update: gonna buy a new motherboard since this one seems to be dead. Curious as to whatever killed it.