🚀 go-pugleaf

Hello,
Last night I was downloading some data from our VAX in Texas to my Mac+
for use in Excel.  I needed to replace the spaces between the columns of data
with tabs and I was using something called Nac-Tabs.  After running the 
Program I tried to open Excel to paste the data and heard a loud pop from the 
top/left/back of the Mac+.  The screen first blanked out and then came
back with odd patterns on a flickering screen.  I powered down and restarted
with no apparent problem and the pop did not happen again.  However, after
modifying a few data files I began to get a number of system errors with
ID=12 and/or ID=28.  After a while I didn't get them anymore, but I had moved
on to other tasks by that time.  Can someone tell me:

1)  What was the pop?  Is it serious?  Anything to be done?

2)  Were the later system errors related to the pop or should I look at the
    combination of programs I was running?

3)  When I get these ID numbers is there some place for me to look up what
    they mean?  

I'm fairly new to the Mac world and could use a hand in getting educated.
Any help you could send my way would be greatly appreciated.

You can reply by e-mail to: mudpit@lamont.ldgo.columbia.edu

The system is a Mac+ with 2.5 meg, Ehman 30+ hard drive, System 6.0.2,
Excel 1.04, and Nac-Tab 4.0.

Thanks much in advance.

-- Dan Quoidbach
   Lamont-Doherty Geological Observatory