<br><br><div><span class="gmail_quote">On 1/2/07, <b class="gmail_sendername">Bryan Backer</b> <<a href="mailto:bbacker@yahoo.com">bbacker@yahoo.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Matthew,<br><br>Since you're ruled out the normal problems, how about something<br>from the 'grasping at straws' bucket? :)<br><br>Perhaps it's the momentary switch that PCs use for power down?<br>It's bad (intermittent short) or very sensative to static so
<br>the switch is causing a power down? Depending on the<br>physical design of the box, the switch could be<br>exposed outside your case so static is affecting it.<br><br>If you disconnect the momentary switch from the motherboard
<br>(the switch is in the case of course - attached via a header<br>to your MB) and instead use two jumper wires to turn on/off, do you<br>still experience the problem?<br><br>No idea if it will help, but you could try your current setup but
<br>with reset switch and power switch not connected to MB headers.<br>With the case open, use a wire or something to short th MB power ON/OFF<br>momentary switch to turn the computer on, then close the case.<br>Now try your various status electricity tests to see if you can
<br>get the machine to shut down. If you can, forget my suggestion. :)<br>If the machine now stays up, perhaps try swapping out<br>power switch/headers/connectors. If nothing, try the same with<br>reset switch/header/connector.
<br><br>For the record, I've never had a static problem like this, but<br>I did have a similar problem once when cramming a small form<br>factor MB into a wooden box and my home-made power connector<br>kept getting bumped - power on. power off. power on. power off.
<br><br>bb<br><br>--- Matthew Gallizzi <<a href="mailto:matthew.gallizzi@gmail.com">matthew.gallizzi@gmail.com</a>> wrote:<br><br>> On 12/22/06, John E. Kreznar <<a href="mailto:jek@ininx.com">jek@ininx.com</a>
> wrote:<br>> ><br>> > > ... static electricity keeps shutting down a computer we recently<br>> > > built ...<br>> ><br>> > What do you mean "shutting down"? Does it simply freeze as though
<br>> > something is going into a tight loop, or does power get shut off?<br>><br>><br>> It just shuts off. I rub socks on carpet, touch front of case, system<br>> completely shuts off. Doesn't freeze. Last motherboard I tried would
<br>> restart.<br>><br>> Have you probed anything with a 'scope? If the power supply is<br>> > turning off, it must be being commanded to do so, and it would be<br>> > interesting to investigate the source of the command.
<br>><br>><br>> Probed with a scope? Hm, don't think so.<br>><br>> I once added memory (256 KB to a Microdata 3200 -- big stuff in the<br>> > '70s) which turned the computer into a veritable noise detector --
<br>> > extremely sensitive to static discharge. Turned out to be a design<br>> > flaw in the CDC memory. I fixed it by rebuilding the refresh<br>> circuit.<br>><br>><br>> I tried with a different motherboard + different RAM ... still did
<br>> it.<br>><br>><br>><br>> --<br>> Matthew Gallizzi<br>><br><br><br>-- <a href="mailto:bbacker@mail.yahoo.com">bbacker@mail.yahoo.com</a><br></blockquote></div><br><br clear="all"><br>-- <br>Matthew Gallizzi