On 7 June 2016 at 18:18, Aleksandar Kuktin <[email protected]> wrote:
> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > >On Tue, 7 Jun 2016 15:59:39 +0100 > >Ken Moffat <[email protected]> wrote: > > > I still could not tell where the sound was coming from (too > > high-pitched for me to tell - it's everywhere), so I plugged the test > > machine directly into the wall socket : if I turn on the PSU, the > > siren sounds (I had thought it might have been coming from the > > surgemaster iteself, but obviously not). > > > > With the "server" (an old desktop box) the alarm sounds if I press > > the on switch on the front of the case . > > How sure you are it's an alarm, and not the sound a dead PSU makes? > > (sorry if these lines are wide, gmail is hard to tame). I'm not familiar with the sound a dead psu makes. I had one a few years ago, all I remember is the burnt smell. The sound is high-pitched, probably in the high hundreds of Hz, or maybe 1 KHz. But before I sent this reply I googled for the sound of a dead PSU - one forum post where a new PSU solved the problem does seem to match what I'm hearing. I'm not clear about the actual symptoms you are having. I'll post my > understanding, you correct my mistakes. > > You have two "computers". They are both architecturally PC's (not > actual purpose-built server hardware). One is a "test machine". When > the mains power is applied to its PSU, a noise is heard? The > "test machine" does not boot. How many beeps does it make when you > press the "turn on" button? The second machine is "the server". Its > problems are my main confusion. When you plug it into the mains (apply > AC to the PSU), nothing happens - as it should. When you press the > "turn on" button on it, it also starts to produce a high-pitch sound? > Does it boot? How many beeps does it make? > > For the test machine: as soon as I turn the switch on the PSU to 'on' the sound starts. If I then press the power switch on the case the motherboard and CPU fans both start, but I seem to not have any video output (that might be luser error - the KVM switch is dieing, only one position works reliably, maybe I misconnected after failing to boot the test machine to try to do a clean shutdown andlater swapping it back). There is no visible fluff in this machine. I can't tell if the drive powers up because it is an SSD. I'm assuming I understood the problems correctly. Then, the "test > machine" may have a broken PSU, that needs replacement. "The server" > may or may not have a broken PSU, depending on what it is doing. > > The "server" produces a similar sound, but only from the point where I try to power it up from the front panel. Still haven't got behind it to access the PSU switch. > Note that a PSU that broke out of the blue may have damaged internal > components. If you have a third computer about, it would be worthwhile > to transplant the disks and check if they are still alive and the data > readable. That way, you will know if it's worth investing time into > repairs. > Getting space to open them is a pain, but yes I have other machines (using one of them at the moment). > > The PSU may or may not have died for no good reason. How old is it? > Most consumer electronics are not built to last more than five years, > some fail even before that. If the PSU has a control IC (and it > probably does), it could fail quickly after the five years pass. > > The "surgemaster" thing also may or may not have some interesting > electronics in it which may or may not have failed (and destroyed both > PSUs simultaneously). How is the switch holding up? > > My main ddesktop machines go through that switch, so it seems to be working fine. I've tried removing the battery from the motherboard on the test machine, then reinserting (I think the manual is a PDF on the server, not sure how to clear the CMOS), but no difference. The server would have been running and I won't be surprised by a failed PSU. But the test machine was using minimal power (nominally powered off, probably 5 Watts maximum) and it is perhaps a year old, maybe two, but unlikey to be more than that. ĸen
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