-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >On Tue, 7 Jun 2016 19:36:43 +0100 >Ken Moffat <[email protected]> wrote: > > On 7 June 2016 at 18:18, Aleksandar Kuktin <[email protected]> wrote:
> (sorry if these lines are wide, gmail is hard to tame). My MUA seems to be handling them well. :) > 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 would have been "happier" with, say, 50 kHz because switching power supplies (the kind that gets put into PSUs) usually operate internally at about that frequency. >> I'm not clear about the actual symptoms you are having. I'll post my >> understanding, you correct my mistakes. > 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). Does it beep? A properly operating motherboard will beep twice. In this case, the most important beep is the first one. That's the motherboard firmware saying "I'm alive". Fans are simple devices and will operate even if the PSU outputs "wrong electricity", say a train of 100Hz pulses instead of a steady voltage. > [snip] > > Getting space to open them is a pain, but yes I have other machines > (using one of them at the moment). You'll probably need to open the machines. The traditional way of doing this is to have a known good computer and then swap in parts from a broken computer, waiting to see when it will fail. In theory, I'd first concentrate on the disks and make sure they are alive. If the disks failed (got fried), then you will at least discover that early. But in practice, it's probably good enough to replace the PSU with a known good one and see if the machine boots. Make sure the KVM magic is working well. :) If it does not boot, I'd do the whole transplant-bit-by-bit ritual. Beware hasty conclusions. > 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. Hmm.. bizarre. Yet, everything is possible. Note that the fact the PSU was switched off may not be of any significance. There's no way to know without knowing more about its internals. BTW, I'm not a believer in various bits of folk knowledge about fluff and dust causing problems. :) Apart from the fans and optional disk platters, those are all sold-state devices. *Maybe* they overheated due to the lack of air current, but I'm still not a believer. - -- Svi moji e-mailovi su kriptografski potpisani. Proverite ih. All of my e-mails are cryptographically signed. Verify them. - -- You don't need an AI for a robot uprising. Humans will do just fine. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iQIcBAEBAgAGBQJXVxwHAAoJEKa4cgqNx31/ZJIP+wVxRkqTi9w4DSm9QxNCn4so /yExF4ywCaw307EfldqxiXv23pVvDQnfvMB4w8gQ6fclOyfPXWp6msIpuQj4HPH8 IilxtBZK13i1Zh73KGbo7z4366eBFTLzNU+VndGWEpJd1TEZdqIzblw/71K6jyS4 UVLOinhjV2HISZ/h/MvxEKH6p6oj8ozQJWkawBT3c2EQPjVw6XDtDmdrhKd6ZCXL B5RiWxZy2YVs3M7F46Wh6mlpuVUHEOphkn1Cs70SAeiTLRPDn8bc+Vu/8v4EFXSQ 9c1nmWrbCYjyKEoZnZ1X1F230iekrA/5+sX4YpZ//HobG3EIlIy0tY9jyIdK7LaV m4F4cuziHHVCp2jhH7JiZkp7UPRMvR5Le9EfP93v4+Zi1uPvev9l4CKo8jtMkXl8 17qQpl/V0xT7xex8l4/OtD6t6HN4GxSKYVxCvCiSeQXn71EKxtc2HbIHnUsuF8SM DHwR+EvGDMnQ9rIHBVda45cnyJ685otf5bl4vYWlKrjHdJWvJX5woZA0FO6p/s4i UsKPE5QuwFlcGcJ1+vPIaBp3v3o/mGY5caioah3DAwaXPpMoCesfCw37iKJopTce KvBg4w+6Sk1LGFj1FJUhKE8R+c/gmFxNl0QEI9KQ56MzgHVinWpbVJlQQniJ7Uya 77u5mzPSa08+26EUEoZZ =X3hL -----END PGP SIGNATURE----- -- http://lists.linuxfromscratch.org/listinfo/lfs-chat FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
