[SunRescue] Problem with a SPARC2

[Mike Hebel]

Two things immediately come to mind:

1) The RAM is bad and not even allowing a minimum POST of the motherboard.

2) A bad drive can "sometimes" lock the scsi bus enough so that the system
won't post.  (Take this second one with a grain of salt as I've seen it more
with PCs that Sparc.)

A rare but third possibility is that the ground wire in the power supply is
intermittent enough to cause the LEDs to light but not provide a good enough
setup for the POK signal to work properly.  (I'm at my limits of Sparc
hardware knowledge here so if anybody has any better answers feel free to
speak up.)  I don't know how to test the POK signal but I'm sure someone
here knows.

Try replacing the RAM and only installing one bank at a time.  This will
probably tell you if the problem is "about" RAM or not.

Hope this helps!

Sincerely,

Mike Hebel

-----Original Message-----
From: rescue-admin at sunhelp.org [mailto:rescue-admin at sunhelp.org]On
Behalf Of Wallace E. Owen
Sent: Thursday, April 13, 2000 12:17
To: rescue at sunhelp.org
Subject: [SunRescue] Problem with a SPARC2


I've been trying to easter egg a problem with my SS2.  The symptom
is that the green LED doesn't light, the display never comes up and
the keyboard LEDs never blink.

I bought a 'new' (never used spare in the box) replacement motherboard,
stuck it in the case, and got the same symptoms.  The power supply's
red LED lights, there's 5.0V, +12V and -12V coming out of it and going
into the motherboard.

Any ideas?


  // Wally