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michael smith Mar 17, 2012, 05:45am EDT Reply - Quote - Report Abuse
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Hello Everyone,

I built a rig with a friend 2 weeks ago, installed everything and it was running fine first few days (Nothing is Overclocked and i don't plan on it ) however for the last few days it works fine, but when i power down the next day it wont turn on :S . I push the power button and i see the fans light up for half a second but they don't spin, and then nothing. The green light is working on the Mobo and normally i sit there unplugging cables from PSU and GPU and mains etc and eventually it starts and works fine all day, then a day or 2 later it happens again. I know this is long-winded so thanks for reading :)

PC build of the top of my head is:

OS - Windows 7 ULTIMATE 64BIT
CPU - intel quad core 2.4GHZ
Mobo - ASUS P5G41T-M LX
GPU - Nvidea 9600 GSO 768MB
RAM - Kingston HyperX 8gb
PSU - Modular PowerCool 750W

Any information is greatly appreciated, im hoping its not the PSU as it works fine all day >.<


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micro Mar 17, 2012, 11:07am EDT Reply - Quote - Report Abuse
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>> Re: Custom Build power issues
My first though it a bad/weak power switch on the case.

Try disconnecting all the wires besides the power switch and see if that helps.

The only other time i have seen this is with a bad mobo, but it would never fire up.

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michael smith Mar 17, 2012, 02:55pm EDT Reply - Quote - Report Abuse
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>> Re: Custom Build power issues
Do you mean the keyboard, mouse , audio jacks etc ? Or Gpu and fans etc ?

Thank you :)

john albrich Mar 17, 2012, 03:26pm EDT Reply - Quote - Report Abuse
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Edited: Mar 17, 2012, 03:54pm EDT

 
>> Re: Custom Build power issues
.
Some thoughts:

It's possible your PSU is operating right on the hairy edge of its power capacity, or its faulty and isn't capable of reliably delivering its full rated power on one or more voltage rails, etc...which can result in intermittent start-up operation like you've described, with fan LEDs briefly lit, while other voltages remain supplied to some devices (depends on the PSU design robustness and spec compliance...dirt cheap PSUs are more unpredictable). Try disconnecting EVERYTHING that isn't needed to boot to the BIOS screen. This will lower the power load being placed on the PSU, and minimize the connection variables. This is pretty much the start of the "standard" debugging procedure and is discussed in posts referenced in:
http://www.hardwareanalysis.com/content/topic/77189/#587007
For now, you can disregard the bits about clearing CMOS and isolating software from hardware by booting from a CD/DVD/USB. The main goal is to see if you can get the system to power-up reliably in the absolute minimum configuration. Once that is determined as a go/no-go...then follow-up actions can be explored.


Also, as you are minimizing the configuration...
Check each and every power connector (male and female sides) for contamination, misalignment, and that when inserted a pin or sleeve isn't "pushed back".
Gently tug on the wires behind the end of the connector and verify the pin or sleeve doesn't move back and forth (axially) in the connector.
Make sure when you connect things like the CPU and video card connectors, that they actually latch into place and/or are fully seated and there's no interference inside or outside of the connector keeping them from being fully seated.
Check to make sure none of the connectors show signs of "burning" (like carbon spots or partially melted metal and/or plastic)

edit:
minor add of sentence to explain goal of minimal config debug

edit to add:
BTW, while you are doing anything inside the case of a PC, you need to be sure to follow appropriate ESD and power protocols. These are discussed in the debug posts as well. Example of one consequence: when connecting/disconnecting anything in the PC, it is NOT sufficient to simply turn off the system using the front panel switch. If AC power is still supplied to the PSU, then the PSU is supplying some power to the motherboard. Removing memory, adapter cards, etc. while AC power is still supplied to the PSU can result in damaging those items and/or the motherboard. One must either remove the AC mains power cord, or switch-off the PSU's rear power switch (if it has one), then wait 30 seconds or so for residual power in the PSU to dissipate before doing any more work.

micro Mar 18, 2012, 03:15pm EDT Reply - Quote - Report Abuse
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>> Re: Custom Build power issues
michael smith said:
Do you mean the keyboard, mouse , audio jacks etc ? Or Gpu and fans etc ?

Thank you :)


The wires going from the case to the mobo.
It could be a problem with the power switch on the case, or if one of the wires is connected to the wrong pin (which is easy to do).

I would first disconnect all of the wires from case to mobo, then only connect the power on/off wires.

If this has no effect, you could try connecting the reset switch on the power on/off and see if it will work then.

As far as jumping the mobo and bypassing all of the case switches i don't know if you just connect the two pins together and disconnect, or if you have to continually hold them together to make the mobo power on. *Do this at your own risk*.

GA-Z68X-UD3H-B3, 2600k @ 4.0
16 gig Corsair Vengeance
Evga gtx 260 216, samsung 2253lw"
Baracuda 7,200.12 CoolerMaster 212 +
Win 7 64, fsp fx700-gln, Razer DA,G15
Evil is powerless if the good are unafraid
Silence in the face of evil is it's self Ev

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