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 Post subject: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 4:13 pm 
8086
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An older computer that I was using no longer powers on when plugged in and the power button is pressed. When the power supply is plugged in, a green light on the motherboard illuminates and the power supply makes a strange sound. If I yank the cord out of the power supply, the sound continues for a second or 2, shifts into a shrill whine and then, after a second or 2 of that, dies out.

Is this the death wail of a powersupply or should I be looking further?


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 Post subject: Re: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 4:29 pm 
Clawhammer
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Probably, I'd replace that first.


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 Post subject: Re: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 5:17 pm 
8086
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I'm concerned because the power supply was working fine, but then after I did some work on the computer (cleaned the dust out of it, applied new thermal paste) this problem started up. The noise definitely comes from the power supply, but I'm still concerned that I might have effed up the processor somehow.

I might have another power supply to test, but this computer is downright ancient (pre-SATA) so I'm not certain if I do.


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 Post subject: Re: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 5:36 pm 
8086
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The sound coming from it is a hissing noise that sounds like steam coming out of a pipe. Apparently there's more to it than that as it scared the cats that were nearby immensely.

The only old-school powersupply I have lying around is incompatible as it has a motherboard plug that has 4 more cables on it than the mobo in this computer has receptacles :(

It's a Celeron D 330, socket 478 (I think). It has been living on borrowed time-the power supply is at least 8 years old-but I'd still like to get to the bottom of this mystery since it was working before I did anything to it.


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 Post subject: Re: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 6:08 pm 
Clawhammer
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The power supply is 8 years old?

Yeah, it's probably dying. Hardware may just fail all of a sudden.


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 Post subject: Re: Power Supply Problems?
PostPosted: Wed Jan 08, 2014 6:27 pm 
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try a couple of drops of oil in the PSU fan. peel the tape back at the center of the fan to expose the bearings.

the other PSU may have a 20+4 plug, see if the end four wires will slide off the 20 pin plug.


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 Post subject: Re: Power Supply Problems?
PostPosted: Thu Jan 09, 2014 12:50 pm 
8086
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Scarily enough, I left it plugged in for about an hour and it turned itself on and has been chugging along (barely able to handle XP) ever since. I don't have an explanation for it, I guess the hunk-of-junk eMachine decided that it wasn't ready to die yet.


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 Post subject: Re: Power Supply Problems?
PostPosted: Thu Jan 09, 2014 3:52 pm 
Coppermine
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I'd suspect the capacitors are leaking inside the power supply. If the computer seems to have odd errors I'd really suspect the power supply. You could pull the cover off of the power supply and peak inside. No need to worry about voiding the warranty. I would strictly look at the capacitors and not poke around inside the power supply. Unplugged of course!


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 Post subject: Re: Power Supply Problems?
PostPosted: Fri Jan 10, 2014 11:56 am 
Coppermine
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g.m.waters (red ranger3) wrote:
the other PSU may have a 20+4 plug, see if the end four wires will slide off the 20 pin plug.

Do this.

Also what model eMachine?

Also, eMachines weren't hunks of junk. They were very budget PCs made usually with off the shelf components for a bargain price. But yes, at 8 years it is going to show serious age.


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