Weird problem, anyone got any ideas....
in [Computers]
|
Prev: Copyright
Next: Something to consider for Win 7 users.
From: XR8 Sprintless on 11 Feb 2010 09:27 I have a customer who I built an I7 - 920 system for which is giving problems but only at his residence and does not fail in my workshop. The system is running an Intel BLKDX58S0 motherboard with 6gb Ram and a Radeon 4850 Video Card. It is powered with a Gigabyte 550W Power Supply. It has two Hard Drives in Raid and two DVD Drives. Basically the machine simply will not even turn on at his house whilst it will turn on in the workshop without an issue. In fact I have turned it off and on over 30 times today and it has not failed once. At his residence the machine will not turn on at all even with nothing connected. I have checked his power supply which is running at 246V AC whereas mine runs at 234V. The wiring is correct. I have swapped power supplies in an effort to resolve this issue but that did not make any difference, the machine still would not turn on at all. Anyone have any sensible suggestions as to what else I could check?
From: atec 77 "atec on 11 Feb 2010 09:41 XR8 Sprintless wrote: > I have a customer who I built an I7 - 920 system for which is giving > problems but only at his residence and does not fail in my workshop. > > The system is running an Intel BLKDX58S0 motherboard with 6gb Ram and a > Radeon 4850 Video Card. It is powered with a Gigabyte 550W Power Supply. > It has two Hard Drives in Raid and two DVD Drives. > > Basically the machine simply will not even turn on at his house whilst > it will turn on in the workshop without an issue. In fact I have turned > it off and on over 30 times today and it has not failed once. > > At his residence the machine will not turn on at all even with nothing > connected. I have checked his power supply which is running at 246V AC > whereas mine runs at 234V. The wiring is correct. > > I have swapped power supplies in an effort to resolve this issue but > that did not make any difference, the machine still would not turn on at > all. > > Anyone have any sensible suggestions as to what else I could check? > Use a cheap ups to regulate the voltage , it's way to high and your getting effects from the switch mode having a pup
From: Rod Speed on 11 Feb 2010 13:22 XR8 Sprintless wrote: > I have a customer who I built an I7 - 920 system for which is giving > problems but only at his residence and does not fail in my workshop. > The system is running an Intel BLKDX58S0 motherboard with 6gb Ram and a Radeon 4850 Video Card. It is powered with a > Gigabyte 550W Power Supply. It has two Hard Drives in Raid and two DVD Drives. > Basically the machine simply will not even turn on at his house whilst it will turn on in the workshop without an > issue. In fact I have > turned it off and on over 30 times today and it has not failed once. > At his residence the machine will not turn on at all even with nothing > connected. I have checked his power supply which is running at 246V AC whereas mine runs at 234V. The wiring is > correct. > I have swapped power supplies in an effort to resolve this issue but that did not make any difference, the machine > still would not turn on at all. > Anyone have any sensible suggestions as to what else I could check? Most likely you didnt check the wiring properly. Did you actually measure what happens inside the power supply when its turned on ? Bet you will find that it shuts down because it decides that there is a short on the power supply. Did you try it on more than one power point at his house ?
From: idgat on 11 Feb 2010 16:19 On Fri, 12 Feb 2010 00:27:47 +1000, XR8 Sprintless <xr8_sprint(a)hotmail.com> wrote: >I have a customer who I built an I7 - 920 system for which is giving >problems but only at his residence and does not fail in my workshop. > >The system is running an Intel BLKDX58S0 motherboard with 6gb Ram and a >Radeon 4850 Video Card. It is powered with a Gigabyte 550W Power Supply. >It has two Hard Drives in Raid and two DVD Drives. > >Basically the machine simply will not even turn on at his house whilst >it will turn on in the workshop without an issue. In fact I have turned >it off and on over 30 times today and it has not failed once. > >At his residence the machine will not turn on at all even with nothing >connected. I have checked his power supply which is running at 246V AC >whereas mine runs at 234V. The wiring is correct. > >I have swapped power supplies in an effort to resolve this issue but >that did not make any difference, the machine still would not turn on at >all. > >Anyone have any sensible suggestions as to what else I could check? Same power cord both locations? Same result at different power points throughout customer's residence? -- idgat Compuglobalhypermeganet Inc.
From: Doug Jewell on 11 Feb 2010 16:38
XR8 Sprintless wrote: > I have a customer who I built an I7 - 920 system for which is giving > problems but only at his residence and does not fail in my workshop. > > The system is running an Intel BLKDX58S0 motherboard with 6gb Ram and a > Radeon 4850 Video Card. It is powered with a Gigabyte 550W Power Supply. > It has two Hard Drives in Raid and two DVD Drives. > > Basically the machine simply will not even turn on at his house whilst > it will turn on in the workshop without an issue. In fact I have turned > it off and on over 30 times today and it has not failed once. > > At his residence the machine will not turn on at all even with nothing > connected. I have checked his power supply which is running at 246V AC > whereas mine runs at 234V. The wiring is correct. > > I have swapped power supplies in an effort to resolve this issue but > that did not make any difference, the machine still would not turn on at > all. > > Anyone have any sensible suggestions as to what else I could check? > 246V shouldn't cause an issue - it is only 2.5% above 240V and a tolerance of +/-10% is acceptible on the mains. But if the PSU is designed for 220V as many are, it will be seeing a 12% over-voltage, which may be enough to shut it down. Have you tried swapping the PSU for a completely different brand? This would be what I consider the most likely issue. Another strong possibility is noisy power. You may be measuring 246V, but if there is a lot of noise on the line it may well be spiking several hundred volts higher, which would be sufficient to throw a PSU into error. Try a good quality power filter (not just a surge protector). Other possible causes (admittedly many of them clutching at straws, but they do happen): Check that active & neutral are wired the correct way. Easiest way is to measure voltage to ground. N-E should be 0V, A-E should be full 240V. (some meters may throw the earth-leakage switch, so be careful). If looking at a wall socket, Active is the left-hand hole. I assume when you measured the voltage you measured it at the point. Try measuring it at the end of the cord. I've seen faulty power cords before - did you use a different cord or the same cord when you tried at your place? Alternatively, perhaps it is a faulty power point / power board that isn't making good contact with the plug on the cord? You say you have tested with nothing connected - did you start with the computer, plug it into the wall then try starting it? or did you start with peripherals plugged in then one-by-one unplugging them? I've seen peripherals throw an error state that will stop the PSU starting, and it then needs to be disconnected from power for a while before it will start back. Good luck, and when you do solve it, please report back what you found. -- What is the difference between a duck? |