Urgent: PC wont turn on with PSU connected to MOBO

[Naifamar]

Hi guys, I got a problem when turning on PC yesterday, all of a sudden it stopped turning on. I had it happened once before but I played with PSU unplugging plugging it in, and it worked, not this time.
I took mobo and everything out if case, took paperclip and shorted 4, 5 pin if 24pin and PSU worked good, giving power to fans and RGB, but when I tried connecting it to mobo again and jumpstart with screwdriver its not working.
I also tried inserting everything again like fans, RAM, 8pin CPU and 24 PIN : not working.
please help
Cpu is i5-12400KF , 3060TI Gpu, msi 660 mortar ddr4 mobo
I took RAM out and it once turned on, but when I tried again, it’s not working

Screenshot, 2024-05-07 19:33:48 - Paste.Pics

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[STSMiner]

Replace the CMOS battery with a new one on the motherboard to rule that out.

 

[maxfly]

It sounds like your mb may have bit the dust unfortunately. If it's under warranty I would pursue a replacement.

If it's not under warranty try to test your gear in a friends rig to eliminate any possibility of your CPU, PSU, memory or GPU being damaged and to confirm that it's the MB that's bad.

If that's also not a possibility, you're looking at either having to buy a new mb (most likely) or having to take your rig to a shop for testing. Which may end up being more expensive than a new mb...so yeah. No easy resolution.

 

[DeathtoGnomes]

did you check the power switch wires are plugged in (correctly?)?

 

[Waldorf]

@STSMiner
as good as saying "(just) leave the bathroom light on"
the battery is to power the clock when sys is off, and to keep settings if power is cut,
nothing more.

i ran my rig for almost 3 weeks without the battery, and since i have a UPS,
didnt even lose the settings..

@Naifamar
pre-POST trouble is usually psu, maybe board.
see if you can try a different psu, as it would really leave only the mb, since everything worked before.

 

[Naifamar]

did you check the power switch wires are plugged in (correctly?)?

Yes I tried to yse screwdriver

@STSMiner
as good as saying to leave the bathroom light on.
the battery is to power the clock when sys is off, and to keep settings if power is cut, nothing more.

i ran my rig for almost 3 weeks without the battery, and since i have a UPS,
didnt even lose the settings..

@Naifamar
pre-POST trouble is usually psu, maybe board.
see if you can try a different psu, as it would really leave only the mb, since everything worked before.

It somehow turned on once, Idont know how its possible. Only 1 time recently I managed to turn it on, I just took RAM away, now I dot the same and its not working

It sounds like your mb may have bit the dust unfortunately. If it's under warranty I would pursue a replacement.

If it's not under warranty try to test your gear in a friends rig to eliminate any possibility of your CPU, PSU, memory or GPU being damaged and to confirm that it's the MB that's bad.

If that's also not a possibility, you're looking at either having to buy a new mb (most likely) or having to take your rig to a shop for testing. Which may end up being more expensive than a new mb...so yeah. No easy resolution.

Yes I was thinking on getting new MOBO and if its not working going to shop for some diagnostic

 

[Waldorf]

i would still test another psu first, as its not that common for boards to just give up completely.

 

[Fourstaff]

Sometimes its the RAM which causes issues, please check that too. Also check for shorts especially on the motherboard.

 

[Naifamar]

Sometimes its the RAM which causes issues, please check that too. Also check for shorts especially on the motherboard.

How do I check for short? With multimeter?

 

[QckSilver]

Sir have you tried turning it off and on?

Joke aside, remove everything from the board and try to start it.
I do mean everything, CPU and RAM included, if it beeps, it lives, otherwise it's pretty much dead.

 

[STSMiner]

@Waldorf
Some motherboards will not post / boot if the CMOS battery is dead, I know as I've just recently had to replace a battery on one of my motherboards here.

Reddit thread on the same issue / symptom the OP is having (I had the same issue 3 months ago btw), so change the CMOS battery to rule that out, it's the cheapest first step.
https://www.reddit.com/r/buildapc/comments/oohxtv

 

[Naifamar]

@Waldorf
Some motherboards will not post / boot if the CMOS battery is dead, I know as I've just recently had to replace a battery on one of my motherboards here.

@Waldorf
Some motherboards will not post / boot if the CMOS battery is dead, I know as I've just recently had to replace a battery on one of my motherboards here.

Reddit thread on the same issue / symptom the OP is having (I had the same issue 3 months ago btw), so change the CMOS battery to rule that out, it's the cheapest first step.
https://www.reddit.com/r/buildapc/comments/oohxtv

Thanks, will try tomorrow and text back!

 

[Waldorf]

@Fourstaff
but that wouldnt show up out of the blue, with the system working fine before (as in not a new build).

@STSMiner
sure, but i would still say with the batt removed, it would, for any boards in the past 3-5y
(ignoring for a moment it was on evga (not msi) and unit had two bios chips and it happened after oc session)

there even is a reply by someone with the mb not turning on,
but did, after removing the batt.
dont think most ppl have actually tried it, and just replaced the battery.

same with laptops, i have yet to see one not turning on after main battery is removed (unit on AC),
incl those that wouldnt do anything while a dead battery was installed.

 

[Fourstaff]

@Fourstaff
but that wouldnt show up out of the blue, with the system working fine before (as in not a new build).

@STSMiner
sure, but i would still say with the batt removed, it would, for any boards in the past 3-5y
(ignoring for a moment it was on evga (not msi) and unit had two bios chips and it happened after oc session)

there even is a reply by someone with the mb not turning on,
but did, after removing the batt.
dont think most ppl have actually tried it, and just replaced the battery.

same with laptops, i have yet to see one not turning on after main battery is removed (unit on AC),
incl those that wouldnt do anything while a dead battery was installed.

Sometimes its lose screw, sometimes its just some unfortunate component touching the next. Usually Ill carefully inspect all the connections and the mobo mount before testing component by component. The minimum requirement to POST is PSU, Mobo, RAM and Processor. PSU has been tested, I have requested to test the RAM, and Processor is almost always not the culprit (but can happen).

 

[FoulOnWhite]

How do I check for short? With multimeter?

Make sure you only have the correct standoffs fitted, you can always remove the board and test it on a box to make sure there are no shorts. 1 stick of ram cpu with cooler and a gpu is all you need to test.

 

[STSMiner]

@Fourstaff
but that wouldnt show up out of the blue, with the system working fine before (as in not a new build).

@STSMiner
sure, but i would still say with the batt removed, it would, for any boards in the past 3-5y
(ignoring for a moment it was on evga (not msi) and unit had two bios chips and it happened after oc session)

there even is a reply by someone with the mb not turning on,
but did, after removing the batt.
dont think most ppl have actually tried it, and just replaced the battery.

same with laptops, i have yet to see one not turning on after main battery is removed (unit on AC),
incl those that wouldnt do anything while a dead battery was installed.

Not everyone leaves their PC on 24/7 so your argument is null and void.
Did you even read the OP's original post .... the first sentence ???!!!??

Yes, some motherboards will boot just fine with no CMOS battery, but I've also seen some that will not.

If the CMOS battery is dead some motherboards will not post / boot from "COLD START".

Lets wait for Naifamar to reply back here with results after replacing the CMOS battery with a new one and then we go from there or not.

 

[Waldorf]

@Fourstaff
dont see anything tested regarding psu, except if its to check if its powering on,
but thats not really a test to see if it can actually power on the rig.

@STSMiner
where do i make any statement regarding leaving the rig on 24/7?
and, yes I read it.
and that's why i doubt its the battery, as it wont magically come back to life once its dead,
as the pc powered on here and there.
dead battery is dead battery...

again, i would like to see all those ppl claiming it wont boot, try with just the battery removed,
not straight up replacing it, as dead inserted battery, is not the same as none installed.

 

[Fourstaff]

@Fourstaff
dont see anything tested regarding psu, except if its to check if its powering on,
but thats not really a test to see if it can actually power on the rig.

@STSMiner
where do i make any statement regarding leaving the rig on 24/7?
and, yes I read it.
and that's why i doubt its the battery, as it wont magically come back to life once its dead,
as the pc powered on here and there.
dead battery is dead battery...

again, i would like to see all those ppl claiming it wont boot, try with just the battery removed,
not straight up replacing it, as dead inserted battery, is not the same as none installed.

Can retest again if you are really certain that PSU is the problem.

 

[STSMiner]

@STSMiner
where do i make any statement regarding leaving the rig on 24/7?

Post #5 ..... left PC on for 3 weeks with no CMOS battery (OK, so not 24/7, but ....)

OP's original post he states....

Hi guys, I got a problem when turning on PC yesterday, all of a sudden it stopped turning on. I had it happened once before but I played with PSU unplugging plugging it in, and it worked, not this time.

The fact that it happened once before (we don't know the time frame here) indicates that it could possibly be a CMOS battery that's on it's last legs and will die eventually.

Can retest again if you are really certain that PSU is the problem.

Nah, he tested the PSU, states that in his first post.

 

[Fourstaff]

Nah, he tested the PSU, states that in his first post.

Yes, that is what I thought but Waldorf seems to think the PSU has enough power for auxiliaries but not to POST.

 

[Waldorf]

@Fourstaff
just going with experience of pc's not powering up at all.
lots of times a (new) psu did the trick, and trying a different one is always a good idea,
at least vs getting a new board.

@STSMiner
nope, never said i left it on.
but its my mistake for using "ran", instead of "used daily", as i turn my rig of at night.
(in short, technically speaking, unless you lose utility power, you can run a pc without the battery, while retaining bios settings)

just because it turns on (psu), doesnt mean it works properly.
which is why i said to test with another unit.
i would never spend money replacing the board, only to find out it was the psu.
(easier to "swap" that with one from a friend/family, than trying with another board)

 

[STSMiner]

just because it turns on (psu), doesnt mean it works properly.
which is why i said to test with another unit.
i would never spend money replacing the board, only to find out it was the psu.
(easier to "swap" that with one from a friend/family, than trying with another board)

Yes, not ruling out the PSU, but the basic test passed, so next stage is to test to see if the CMOS battery is the problem as that's the cheapest option before pulling the plug to buy a new PSU and changing it out and all the cables.

Only three things will stop a PC booting

1/ No power cable plugged into the PSU due to user error
2/ Dead short somewhere (motherboard or some other component or PSU)
3/ Dead CMOS battery with some motherboards

My ASUS H110-PLUS motherboard failed to boot a few months ago, the symptom was like I had a dead short somewhere, but it was the stupid CMOS battery that died after 4 years.

 

[Naifamar]

Yes, not ruling out the PSU, but the basic test passed, so next stage is to test to see if the CMOS battery is the problem as that's the cheapest option before pulling the plug to buy a new PSU and changing it out and all the cables.

Only three things will stop a PC booting

1/ No power cable plugged into the PSU due to user error
2/ Dead short somewhere (motherboard or some other component or PSU)
3/ Dead CMOS battery with some motherboards

My ASUS H110-PLUS motherboard failed to boot a few months ago, the symptom was like I had a dead short somewhere, but it was the stupid CMOS battery that died after 4 years.

Today I tried to power on and it worked again one time, then not powering, I think this should be faulty battery ? Will buy new today

 

[Waldorf]

@Naifamar
try, but if it doesnt help, see if you can borrow another psu, just to able to exclude it,
as it basically only leaves the board as cause.

 

[Chrispy_]

The minimum requirement to POST is PSU, Mobo, RAM and Processor. PSU has been tested, I have requested to test the RAM, and Processor is almost always not the culprit (but can happen).

To see if the board is dead, you don't even need RAM or a CPU. Just some way to know if the board is attempting to POST.
Either a PC speaker on the front panel header, or diagnostic LEDs if the board has them.
If you have neither a speaker nor diagnostic LEDs, plug a fan into the CPU fan header, see if it spins.