PC turns on only after the power is supplied to the cabinet for sometime (typically 15 mins)!

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Rocky1805

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Jun 9, 2016
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My PC :
Motherboard : Gigabyte GA-H61M-S1
PSU : Zebronics Platinum Series ZEB-800W
CPU : INTEL(R) CORE(TM) i5-3570K @ 3.40GHz
RAM : 10 GB (1333 MHz)
GPU : NVIDIA GeForce GTX 950
OS : Microsoft Windows 10 Pro

So,The problem is .. My PC won't turn on until 15 mins of supplying power to the cabinet..
And no, the fans are not running too..
But once it is on.. It works like a normal PC.. No glitches at all! And if I switch it off (incl power supply from wall socket) and then try to switch on again it responds well as long as the time gap is not long (like 10 mins)..but if dont switch off the power supply to PSU it responds whatsoever the time gap is!
I tried changing the CMOS battery as indicated in some other thread but that didn't work! Can someone tell me what's wrong with my PC?
 
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There's a big difference between startup draw and operating power. I've seen several failing PSU's that couldn't handle startup gracefully, but ran after that. They'd do things like not power up, power up for half a second, or power and boot for 5 seconds and freeze with the lights and fans still running. Some would start if you waited, others if you hit reset a couple times, and in one case the only thing that coaxed it back to life was a hair dryer to warm up the circuits. That last sort of resembles the ~10 minute window you get if maybe it's the circuits cooling.

You said you've already tried replacing the PSU, and assuming both are good that does point towards the mobo having some sort of standby power issue, like a cap that isn't...
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Rocky1805

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That didnt work ! Is that a sign of a dying motherboard or is something wrong with my PSU?
 
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Ironsounds

Ironsounds

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Jul 31, 2011
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Hello... 1) re-check your main PS connection to your MB.
2) Re-check your case switch to the MB connection.
3) Try a different Power switch connection ( use a manual "momentary" short to the MB pins) to test case switch/connection.
4) Test the PS on it's own... pins 16&17 "PowerON" circuit ( use a manual "momentary" short to the PS Connector pins) https://en.wikipedia.org/wiki/ATX see item v.
5) Give another PS a try.
 
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Rocky1805

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1. All the connections are fine and intact.
2. The switch works fine because as I told already once PC is on,everything works flawlessly(including the switch.It responds quickly)
3.That is of no use. Same problem is observed even after shorting the pins.
4. (If I'm not wrong) I think it is not necessary because after sometime everything gets sufficient power and runs well.
5. Tried changing the PSU but no use!
There's another thing that happens sometimes...
Sometimes the time and date shown after the boot are wrong !
I'm actually afraid what could happen to my PC later on! :(
 
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TMTOWTSAC

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Jun 27, 2015
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There's a big difference between startup draw and operating power. I've seen several failing PSU's that couldn't handle startup gracefully, but ran after that. They'd do things like not power up, power up for half a second, or power and boot for 5 seconds and freeze with the lights and fans still running. Some would start if you waited, others if you hit reset a couple times, and in one case the only thing that coaxed it back to life was a hair dryer to warm up the circuits. That last sort of resembles the ~10 minute window you get if maybe it's the circuits cooling.

You said you've already tried replacing the PSU, and assuming both are good that does point towards the mobo having some sort of standby power issue, like a cap that isn't discharging properly.

That's not to say it couldn't be something else. For example a faulty wall socket/power strip that send a surge whenever you turn it on. It would work fine after that, but every surge would be damaging anything plugged into it. Come to think of it, that's something to check first, or it could damage replacement parts.

Try this, leave the computer physically unplugged. Then grab a different surge protector and plug it into that socket while both it and the socket are turned on. It could possibly trip right there but doubtful. Now plug the computer into the new power strip and see if it's willing to turn on right away. If it does, then it's either the old strip or the socket wiring itself. Otherwise, I'd say it looks like the mobo if you've already tried two PSU's you trust. Good luck!
 
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Solution
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Rocky1805

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Jun 9, 2016
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Thank you.
I've got it checked and found out that the problem is actually with the cap as you told..
Now it is fixed. :)
 
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