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From: "UEMURA (fka. MAENAKA) Tetsuya" <maenaka@pluto.dti.ne.jp>
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Date: Wed, 27 Jul 2005 09:43:17 +0900 (JST)
Subject: Re: em(4) stops passing data
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I think 4.9V is enough for em0 to work. Your problem is likely not
caused by faulty PSU.

-- 
UEMURA (fka. MAENAKA) Tetsuya <maenaka@pluto.dti.ne.jp>

Posted on Tue, 26 Jul 2005 14:19:28 +0100 (BST)
by author Chris Howells <howells@kde.org>
> > I had had apparently same problem in April. For my time, em0 seemed dead,
> > though no link down message was generated, and could go up again by
> > `ifconfig em0 down; ifconfig em0 up'.
> > My problem was caused by defected power supply which generated around
> > 4.5V instead of 5V, and corrected completely by replacing of power
> > supply.
> Thanks, I've tried measuring that using a multimeter. The 12v rail
> measures at about 12.6v, but the 5v line is only 4.9v. Is this likely to
> cause problems? The PSU is a brand new 450W Antec. The same PSU in a very
> similar system measures similar results.