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Bang during startup

Last response: in Components
June 26, 2010 2:06:20 PM


I received my parts today and started putting the computer together... I was following the instruction from motherboard on how to conenct the power etc...
When I pressed the power button I heard one big bang and next one followed after... It sounded like it came from forward section of teh rig but I can not be sure.... after that the system woulnt load... the lights on the motherbord work, fans work too... But I do not know what is going on, I got all the parts from with insurance on all of them. I will take the build to local pc specialist for them to diagnose the problem and probably gonna leave it with them to finish the build for me.

Any sugegstion on what could of happened?

The parts I got:
Asus Crosshair IV Formula, AMD 890F
850W Corsair CMPSU-850HXUK, ATX Modular
Coolermaster Storm Sniper All Black Case
Coolermaster V8 CPU Cooler
AMD Phenom II X6 1090T Black Edition
1TB Samsung HD103SJ Spinpoint F3, S
Samsung SH-S223C/BEBE 22x DVD±R, 12
1GB XFX HD 5870, PCI-E 2.1, 4800MHz
Arctic Silver 5 Thermal Compound
4GB (2x2GB) Corsair Dominator DDR3

More about : bang startup

June 26, 2010 10:49:11 PM

Based on your extensive experience? how do you insure user/installer error. It would seem there was some sort of an electrical failure, hence bang! pop! boom!
It's interesting to note your selection of components was all top notch, I don't think a novice could make those choices without help, not without many hours of study.
Which brings us to a point, if you don't know how why would you attempt something like this without help/.
Don't worry about it literally no one without some prior knowledge can successfully pull this off and I have watch thousands try (helping when needed).
Since its nearly impossible to attach a fitting incorrectly due to their shapes (I did meet a real big guy who had no trouble forcing a 4pin modular jack in upside down just with brute strength) you might have just ran into a rare PSU fail.
June 26, 2010 11:54:40 PM

The only thing that can really go bang is the power supply, although it is possible for the motherboard to go bang but I would have expected that you would see evidence of it if this had happened. There should be nothing that you can do that can make a power supply go bang apart from perhaps connecting the power supply to 240v mains with the voltage selector switch set at 110v. Hopefully the faulty power supply has not damaged the motherboard, other components should be fine.
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June 27, 2010 1:49:08 AM

Really sounds like a PSU issue. Chances are something wasn't earthed properly or not connected properly or just an outright failure.If the PSU did go then theres always a chance something else has went with it. My PSU went a month ago (luckly nothing else did). Guys in the local PC shop done a good job in testing everything quickly. Can you smell any "burnt silcon" around any components in particular?
June 27, 2010 3:08:56 AM

Its your PSU. Maybe there was too much load on it or its just A bad Brand
June 27, 2010 10:12:23 AM

to op: talk to scan quickly, the longer you take to setup an RMA the harder it is, just go online and rma psu, mobo, cpu, gpu and RAM, I doubt anything else could be hit, they'll either test it and send back what works and replace what doesn't or replace the lot if its been done quickly.

to others: could there be confusion between 8pin pci-e and 8pin mobo? I know the pinout is different but are they physically different?
June 27, 2010 11:37:57 AM

I did already gave them a call but they said to check which parts are faulty. To be honest I could send the parts you listed back to them but once they give me new ones I could make the same mistake if it was somehow my fault. I belive I plugged everything correctly and did not force anything in there.
Hopefully on wed when I leave teh parts with the repair guy that are gonna diagnose each part will give me a better idea whats faulty or not.
Whats even worse is I have to wiat even more now, havent had decent computer for over a month now sinc emy laptop failed.
June 27, 2010 3:25:45 PM

when were they delivered? within a certain period of time they have to accept them back, period, no questions asked. don't let them fob you off. you shoudn't need to pay for a seperate repair guy.

Everything does scream psu failure, probably not your fault, is the psu set to 240V on the switch on the back (it should be by default or it mught auto detect)

June 27, 2010 7:35:24 PM

The repairs will not cost me anything, they will diagnose each part for free to determine which one is faulty. I already gave scan a call after the incident to ask what should be done. They said I need to check which parts were damaged, I also asked if I could take them to professionals to have it checked up. There is no 240V switch on the back... I always had computers plugged in to those mains I dont see how this latest corsair PSU could of been overloaded.
June 27, 2010 9:17:08 PM

unless you have a major fault a power socket will only supply what is being pulled from it, so the socket can't be to blame.

There are two types of 8 pin sockets coming off the power supply, can you look at them to determine if they physically different?

what probably happened is that something created a very low resistance path somewhere in the build, this would have the effect of 'asking' the power supply for more power, this would continue until the psu gives up, often with a bang and some smoke. Now when the PSU gives up, during the process of giving up, the voltages will go a bit wild, and this could cause damage elsewhere.

Unless something was plugged in wrong, or unless some exposed wiring was touching the case (very unlikley and you'd have to break the connectors to make it happen as they are designed not to be able to touch the case), then the PSU being knackered internally is most likely the issue,
June 28, 2010 3:40:53 AM

The overall pain in the but that you gotta SEND and package it and all that is disappointing. I always hate when things brake.
June 28, 2010 3:23:32 PM

To the OP: Please don't underestimate the importance of sending it back under their rules and their timescales, play their game and you'll get the result you want, do not be late, this isn't a scan issue, this is an issue with many/most online retailers.
June 30, 2010 4:12:38 PM

I just left my pc with the tech guys down the local repair shop.... They did a quick diagnostic of the PSU and confirmed it is damaged. They are gonna do diagnosis for each component now to see if any more damage was caused due to the PSU... should know by friday
July 1, 2010 12:36:24 PM


So I left my parts down the tech guys yesterday and they gave me a call today saying they put it all together and it works all fine... gonna go see them in 3 hours to show me that it works all fine.
July 1, 2010 12:45:27 PM

But the PSU is 'damaged' according to them?
July 1, 2010 1:30:07 PM

I will get back to them on that but what they told me on the phone is they might not have plugged it in properly because it is a modular PSU....
July 1, 2010 1:44:08 PM

I was going to ask who they were as they sound like they could be useful to know, but not any more;)
July 1, 2010 7:00:25 PM

They seem good its just the way I understand things over the phone... Iw as a bit stressed at that time.

Right so I am just typing from my new rig which runs really fast.

I went to teh store, the rig was waiting for me, the tech guy had it plugged it to the monitor showed me that it all works. They had installed all drivers for me and the system so all I had to do at home was do what I do.

They explained that there wa sno damage caused to the parts, the bang I heard must have been caused by the mess I left teh cables with and maybe one of them was touchign the case or somethign wasnt plugged in properly. But everythign runs smooth, no problems just no games yet to play.

They also done great job with cable managment and done it quite quick too.

To be honest I should have taken the parts to them in first place because I never built a computer before and I was confident I could of done it but I wasnt experienced enough.

Thanks for the input guys,

July 1, 2010 7:06:27 PM

enjoy it, who did you use? they deserve a mention
July 1, 2010 11:30:58 PM

As I said before there should be nothing you could do to destroy the power supply, shorting the power supply leads to the case or each other should simply shut the power supply down. You should defiantly return the faulty power supply under warranty.