PC will not post/boot after shutting down each time

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57 posts

Master Geek

#2471665 26-Apr-2020 16:55

Gordy7:

1. So the problem seems to be somewhere on the MB between the front panel switch connection and the PSU startup pins.

2. You have upgraded the BIOS and restored to factory defaults....

3. Does the MB look clean and tidy. No sign of swollen capacitors or MB corrosion?

4. How old is the MB? There is some mention on the web of faulty capacitors causing startup problems.

5. Has the MB ever been subject to dampness or water?

6. Any diags in the BIOS to test power startup?

7. Does the PC restart ok.

1. I have switched cases so the front I/O switches are ok, however I will test and jump the pins on the mb

2. Bios has been updated to the latest and factory settings applied, problem still persists

3. MB looks fine no issues.

4. MB is 7 months old.

5. No.

6. Multiple stress tests ran and no issues reported, temps and voltages are fine

7. restarts every time with no issues.

If its hardware I'm picking Mb or PSU, if its software.. who knows maybe a clean reinstall of windows, last resort.

All I know this has me stumped.

Gordy7

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#2471681 26-Apr-2020 17:37

Pretty new MB. You should be able to claim under warranty I would guess.

It is beginning to look like a MB problem.

No power at all for 15 minutes and then repowering and pressing the power switch and away it goes.

I know Windows has a fair bit of MB control but you should be able to Power up a MB and boot into BIOS at least and even into any PC OS.

Could even come down to a dry solder joint on an IC that is floating and only gets into a suitable logic state after the power has been off for 15 minutes.

Appears to need an expert opinion in this.

Take the PC back to the supplier.

Gordy

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.

Apsattv

2388 posts

Uber Geek

#2471690 26-Apr-2020 17:54

What is the power supply you are using? is it modualar , can you unplug all unused cables from it?

The 15 minutes to reboot working again is just for the power draining from the motherboard. Pulling the power lead and holding the case power button down 30 seconds will prove this. If case is open you will see the little light on the motherboard turn off as proof.

Been through all this when mine had a similar issue. It wont be a software issues its not possible to cause such a fault with these symptoms.

Power supplys do fail, even newish ones,, most modern ones have a 5 or 10 year warrenty. By the sound of it the pc is pretty new either a p/s fault or motherboard fault. Won't put you out of $

QuackPipe

57 posts

Master Geek

#2471695 26-Apr-2020 18:15

Apsattv:
What is the power supply you are using? is it modualar , can you unplug all unused cables from it?

The 15 minutes to reboot working again is just for the power draining from the motherboard. Pulling the power lead and holding the case power button down 30 seconds will prove this. If case is open you will see the little light on the motherboard turn off as proof.

Been through all this when mine had a similar issue. It wont be a software issues its not possible to cause such a fault with these symptoms.

Power supplys do fail, even newish ones,, most modern ones have a 5 or 10 year warrenty. By the sound of it the pc is pretty new either a p/s fault or motherboard fault. Won't put you out of $

PSU is a Cooler Master 550w Gold and it’s not modular.

unplugging the power lead and holding the case of power button down for even a minute or two doesn’t get it to boot.

I hear what you’re saying, I can’t even RMA either board or psu at the moment not until level 2 at least. I hope it’s the PSU as I’ve been meaning to switch to at least a 650w fully modular one.

Apsattv

2388 posts

Uber Geek

#2471788 27-Apr-2020 05:11

I think mine was a coolermaster as well.

My dealer wanted to send me a new p/s to install. However i suggested what if it was my motherboard. I ended up shipping the whole pc back. Their system builder pbtech confirmed the issue was the p/s and my dealer arranged a replacement powersupply. A far more expensive modular unit with 10 year warrenty worth over $100 more.

Good luck

Gordy7

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#2471815 27-Apr-2020 09:00

You have said that if you totally remove mains power for 15min, then repower the PC and press the power-on button that the PC starts.

You have already spent a lot of time trying to find the fault. I guess another test would worth a try while you wait for lock-down 2.

A further test to see if the MB faults:

Remove mains power for 15min.

Repower your PC.

Wait 15min.

Try the power-on button. What is the result?

Gordy

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.

Apsattv

2388 posts

Uber Geek

#2472057 27-Apr-2020 13:28

You are overthinking it,

All pulling the power lead does is drain the remaining power from the motherboard

which you can do far faster by pulling the power lead out and HOLDING down the case powerbutton for 30 seconds to drain the remaining power

The other person could contact the place they bought it from and ask for a replacement power supply to be sent out. A lot less hassle than having to send the entire pc back. Sending the whole pc back is a last resort

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QuackPipe

57 posts

Master Geek

#2472064 27-Apr-2020 13:36

Apsattv:

You are overthinking it,

All pulling the power lead does is drain the remaining power from the motherboard

which you can do far faster by pulling the power lead out and HOLDING down the case powerbutton for 30 seconds to drain the remaining power

The other person could contact the place they bought it from and ask for a replacement power supply to be sent out. A lot less hassle than having to send the entire pc back. Sending the whole pc back is a last resort

As stated a couple of times, this does not allow the pc to boot, I still have to wait 15 min (for whatever reason it is) before I can boot again, your method does not allow me to boot earlier.

PC parts were purchased from PBTech, I don't think they would send out another PSU until they can determine it is the PSU through their own testing.

QuackPipe

57 posts

Master Geek

#2472067 27-Apr-2020 13:39

Gordy7:

You have said that if you totally remove mains power for 15min, then repower the PC and press the power-on button that the PC starts.

You have already spent a lot of time trying to find the fault. I guess another test would worth a try while you wait for lock-down 2.

A further test to see if the MB faults:

Remove mains power for 15min.

Repower your PC.

Wait 15min.

Try the power-on button. What is the result?

So remove from mains for 15 min

reinstate mains power, switch on PSU only

wait 15 min

Power on via case button

Gordy7

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#2472076 27-Apr-2020 13:54

QuackPipe:

So remove from mains for 15 min

reinstate mains power, switch on PSU only

wait 15 min

Power on via case button

??

Trying to focus on the fault possibilties...

So remove from mains for 15 min which will discharge whatever is causing the problem as you have already found.

reinstate mains power, switch on PSU only That is correct... that should start up the standby 5v that is used to sense the case button.

wait 15 min that may cause the MB to re-establish a fault condition if it exists

Power on via case button yes. If there is a MB fault that has slowly developed then the PC may not start when the case button is pressed. If the PC starts then you are no further ahead than with your previous test.

Gordy

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.

QuackPipe

57 posts

Master Geek

#2472087 27-Apr-2020 14:30

Gordy7:
QuackPipe:

So remove from mains for 15 min

reinstate mains power, switch on PSU only

wait 15 min

Power on via case button

??

Trying to focus on the fault possibilties...

So remove from mains for 15 min which will discharge whatever is causing the problem as you have already found.

reinstate mains power, switch on PSU only That is correct... that should start up the standby 5v that is used to sense the case button.

wait 15 min that may cause the MB to re-establish a fault condition if it exists

Power on via case button yes. If there is a MB fault that has slowly developed then the PC may not start when the case button is pressed. If the PC starts then you are no further ahead than with your previous test.

As suspected, pc did not boot after this test, having power fed back in has triggered the issue before powering on via case power button

Gordy7

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#2472090 27-Apr-2020 14:39

Forgot to include a check for the MB standby LED between repowering the PSU and before pressing the case button.

I guess your earlier test... removing power for 15min, repowering and pressing the case button meant that there was standby power on the MB.

Gordy

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.

QuackPipe

57 posts

Master Geek

#2472091 27-Apr-2020 14:43

Gordy7:
Forgot to include a check for the MB standby LED between repowering the PSU and before pressing the case button.

I guess your earlier test... removing power for 15min, repowering and pressing the case button meant that there was standby power on the MB.

Correct.

Gordy7

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#2472093 27-Apr-2020 14:44

Could also mean that after repowering the PSU for 15min that the 5v standby has died. Diagnosis is still not conclusive between the MB and PSU.

Gordy

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.

QuackPipe

57 posts

Master Geek

#2472102 27-Apr-2020 14:47

Plausible, as initially when first discovered when pc went into standby it would not wake again.

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