Pc Loud bang

April 18, 2009 at 06:04:56
Specs: Windows XP
using the PC, there was a loud noise, and it went bang. everything stopped working. no smell of burning. Both pc and the monitor went off. the lights in the house were still working, but when I ventured downstairs the tv, dvd, satellite etc were all off. Realising the trip switch had been activated. When I tried turning everything back on, the pc was the only thing not to work. The monitor was working fine, but the pc won't work. Nothing, no lights,fan. sounds. Tried looking inside the Pc, but nothing looks like its blown. Perhaps its in the PSU ? How shall I tackle this without getting ripped off by a shop. The Pc itself is under 2 years old. it's a Packard Bell Multimedia Pc. sorry I can not be more exact than that right now, but I'm at work. I don't have access to a spare computer at home or the internet.
Thank You

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April 18, 2009 at 06:18:57
It appears like you had some kind of power surge that made your circut breakers flip ? Do you have a good surge protector you are using for your PC and all related H.W ? If yes and it did not protect your PC from the surge ,many of these protectors come with documentation on replacing your ruined items if their protector did not do its job ! If you are lucky it only over loaded your PSU (power supply unit) and that blew out ,however there is a good chance if it blew the PSU it fried your M.B. also ,for your sake I hope not !
Good Luck ,Nick

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April 18, 2009 at 07:04:59
Thank you for your reply Nick

- Firstly how can I identify the surge protector, and secondly how can I eliminate if the motherboard has been fried ?



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April 18, 2009 at 09:21:45
If your PC plugs directly into the wall then you have no surge protector. If the PC plugs into somthing like a power strip and that then plugs into the wall then you probably have a surge protector. You can probably reset the surge protector if it tripped. If not, get another one.

If you don't have a surge protector or you reset it or it didn't blow then AC power should be gettnig to your PC. In that case, if the PC is dead then almost certainly the power supply is blown. The bang was likely a capacitor blowing up. That by itself could have caused the PSU to fail or it may have blown the PSU fuse too.

When a power supply goes out it can take the motherboard with it. But the first thing to do is replace the power supply. If it powers up OK after that then consider yourself lucky.

Or it may seem to power up but nothing will show on the screen. That likely means the motherboard is bad.

The above is the most likely scenario. But it's not 100%. So if you have a known working power supply lying around the house you might want to try it before you go out and spend a bunch of money on a new one.

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April 18, 2009 at 10:01:23
Thank you too for taking the time to answer the question.

Now...... I do have another psu, which is from another older computer. Can I use that to test the psu ? even though it's quite different in size and shape. It also has less wires comming out from it, compared to the PSU that I may have blown.

Is the fuse in th PSU the same as a fuse I might swap in a plug ?


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April 18, 2009 at 10:54:59
To answer your question about testing with another power supply (PSU). Look at the labels on both units. Things to compare are the Type/ATX, wattage, 12V Amps. If they are similar then you could try it. You don't need to install it into the case just to test it.

If you post the brand and model of your computer we may be able to help you decide if you even want to bother with that computer or not. If you need to replace both the PSU and motherboard you could spend more than what a new computer might cost. Especially if it is a pre-built like Dell, Gateway, etc.

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April 18, 2009 at 12:08:33
Yeah, the power supply would at least need to have the 20-pin ATX power connection. You couldn't use one of the old AT power supplies. Beyond that, the more wattage the better. You'd probaby need at least 250 watts to get it powered up.

If you were to open the failed PSU you'd probably notice the bad capacitor (assuming that's what it was) and it would be replacable although it might be hard to specifically ID if it blew up. The fuse is replacable too. Both are likely to be soldered on to the circuit board.

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