Date   : Fri, 26 Jun 2009 16:07:02 +0100
From   : mike@... (Mike Tomlinson)
Subject: Only one beep

In article <4A4347C0.7020209@...>, Chris Long
<chris@...> writes

>    The current syptoms are that, on switching on, I get the first low 
>    beep but not the second higher beep - does that indicate a specific 
>    fault?? The caps lock LED coms on, and toggles as expected when I 
>    press the CAPS LOCK key.

OK.  It's _very_ nearly, but not quite, managed to boot.

>    I've checked the PSU outputs with a multimeter, getting +4.8 volts 
>    on the +5 lines and -5.7ish volts on the -5 line - are these 
>    voltages within limits?

Yes.  4.8 is a little low; I'd have preferred to see it closer to 5.0.
Is that at the power connectors on the board?  4.75 is the minimum.

When I first saw your post I thought, ah hah, C9 in PSU.  If you leave
the machine switched on for ten minutes or so to warm up, then hit
Break, does it boot?

Give all the socketed chips a shove to reseat them, and unplug then
replug the keyboard cable at both ends to clean the contacts, and see if
that helps.

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