Weird issue were my PC works fine, but will not boot backup if its shut down.

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Akiraosc

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Jun 6, 2010
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PC is custom built: Here is a picture I just took of the specs, with temps. (~2-3hrs after being booted and working fine)

: https://i.imgur.com/2563eQi.jpg


When I try and turn my PC on (PSU power switch on the back) the fans will spin up for 1-2 seconds and then go off. No beep codes, nothing. Although, if I keep trying, it will eventually spin up the fans once, then twice and then it will keep them on and boot into Windows like a normal PC.

I thought it was the PSU, but got a new one in, from Amazon today. Replaced all of the cables and power cable, with the new one. (New PSU stopped PC from doing a shutdown on its own though. It was shutting down randomly, like clicking the shutdown command in the start menu)

I also got a new CR 2032 3.0v battery and manually cleared the CMOS, since I thought it could possible also be an issue.

The only thing I can think of at this point, is the mobo power front panel connectors has a short, or something.

Before I replace the mobo, I wanted to make a post, to see if anyone else had this issue. Or, if anyone knew what was wrong and could help me.
 
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Did you unplug the power switch and substitute the rest switch??

I ran a case this way for about a year, after the power button fixing clips broke.

Ff you have done this, and the PC is still having issues booting, try unplugging everthing except the essentials, so any non OS HDD, OSD, external drives and USB hubs, if the power surge damaged the motors or power circuits in one of these, they might be overloading the psu.

The last time I had this happen, it was a floppy disk drive motor gone...
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Akiraosc

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The front panel power button stopped working. It doesn't turn on or turn off the PC anymore. I've tried to remove the cables and re-seat them, but nothing helps. This is what makes me think it maybe something to do with a short there.

But... I did find this thread, with an issue a lot like mine, but I am not sure if something like this, could cause my issue. (Ram timings)

http://www.tomshardware.com/forum/331283-31-boot-time

(I do apologize, I forgot to mention before this, I had a power outage and assume it may have something to do with this)

Also the reason for buying the new PSU (was the same model EVGA NEX650G) New PSU keeps the PC from shutting down now, but I still have the issue with initially getting it to turn on and boot up.
 
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CaptainCretin

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If the power button is still connected to the motherboard header, it is likely the switch is damaged internally and causing your issue; the power button is only a momentary connection, so if you have shorted out the pins, this will also cause issues.

If the case has a "Reset" button, the best advice short of buying a new case, is to plug the reset button into the Power header and use it as a power on button.

If you are still having these issues after that, the chances are the motherboard itself is damaged; do you know if the power outage started with a voltage spike? ie lightening strike, or failure at the local substation.
 
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Akiraosc

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I will try this, but I am not sure if it will fix the issue of not coming back on, once the PC has been shut down. (Before it worked fine, if I ever turned the PSU switch off and then back on later, is why I say this.)

I am not 100% sure of the power outage, but I think it was at the local substation.
 
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Akiraosc

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Update: If I barley plug the PSU power cord in, it seems to work and will boot into Windows after 3 times of the fans spinning up.

This PSU is the same as the last one I was using, but is brand new, just got it today. So I am stumped.
 
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CaptainCretin

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Jul 18, 2016
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Did you unplug the power switch and substitute the rest switch??

I ran a case this way for about a year, after the power button fixing clips broke.

Ff you have done this, and the PC is still having issues booting, try unplugging everthing except the essentials, so any non OS HDD, OSD, external drives and USB hubs, if the power surge damaged the motors or power circuits in one of these, they might be overloading the psu.

The last time I had this happen, it was a floppy disk drive motor gone short circuit (yeah, a very long time ago !!).


If doing all that doesnt help, it does sound like a fault with the boards own power regulation circuitry; this is not replaceable, so a new board (and case) are in order.
 
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