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CRASHED! A topic for SEVERE and immediate Hardware and Operating System FAILURES. We will try to get you up again. NOT for Optimization questions!


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Old 2nd October, 2007, 12:14 AM
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Question ticking PSU, computer do not turn on

I'm having problems with turning on my new PC that I built recently.
If I can manage to turn on the computer everything is ok. it runs perfectly. However, sometimes when I turn off the computer, the PSU starts to make a ticking noise (like there is a clock inside) after everything is shut down. And when this happens the computer doesn't re-start as long as the ticking continues. I don't know how/why the ticking goes away but when it does you can turn on the computer just fine. I'm not sure about this but it appears to me when I disconnect/reconnect the 20-pin power cord the ticking stops, and I can turn on the computer.
The weird part is once the computer is on everything works fine, the ticking of the PSU doesn't start until after you shut down the computer. (in other words, the ticking never happens when the PC is on, it only starts when you turn off, and you can only turn on if it stops)
I tried another brand-new PSU, but exactly the same thing happened. I tested both PSU's by jump starting them. Both managed to power a fan. My system is:

motherboard: GIGABYTE GA-965P-DS3
cpu: Core 2 Duo e6750 (core temperatures are fine around 27 C)
heatsink: freezer 7 pro
PSU: COOLER MASTER eXtreme Power RS-430-PMSR/P ATX12V Max: 400W (Continuous), Peak: 430W Power Supply 90~132V / 180~264V

(as i said I also tried another PSU, and that was Cooler Master extreme power 500 Watt)

I'd appreciate if you can guide me through solving this problem.
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Old 2nd October, 2007, 03:32 AM
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The ticking is coming from your +5vsb rail, almost certainly, and you're lucky that it has current limiting built in; many older PSUs do not have current limiting on that rail and will quite happily blow their brains out when overloaded.

So, what's your problem? At a guess, I believe you either have something on your mobo that is overloading the +5vsb (i.e. something is borked on the mobo) or you have some peripherals plugged in that are loading that rail (laser mouse, keyboard with lottalights, or something similar; it COULD be something on the USB bus, also).

That rail is rated at 2 amps for both of those PSUs, which is a hefty load for standby.
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Old 3rd October, 2007, 04:49 PM
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Dude better unplug the pc and throw it away sound slike some one has put a time bomb of sorts in the psu and powered the timer on the 5 volt rai llike giz said.

So yea thorw it away
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Old 3rd October, 2007, 08:52 PM
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Strip it down to the bare items. HDD Video mouse KB and boot it up. If it goes away, plug items in until you get the issue back. THen you found your issue.
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Old 4th October, 2007, 05:07 PM
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Get the mobo out of the case on a protective foil, plug out everything that isn't mandatory and power it on. A short between the mobo and the case can also overload a PSU.
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Old 4th October, 2007, 07:18 PM
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"Protective foil" eep, pretty sure Wolf2000me means something else. Cunductive foil would murder the board.
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Old 5th October, 2007, 12:28 AM
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I think Wolf2000me means an anti-static bag/mat
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Old 5th October, 2007, 08:55 AM
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*ahem* yeah, usually a board comes with an anti-static bag and some white surface foam thing.
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Old 5th October, 2007, 02:34 PM
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foil lolz
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Old 13th October, 2007, 10:53 PM
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I read that the outside of static-protective bags/envelopes, what have you are NOT a good place to put components on.
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