3b1 freezes up.

[Roger Florkowski]

I am having some strange hardware problems with a stock 3b1.
It has a 67meg hard drive and 2meg of ram.

The problem:  unexplained crashes.

The symptoms:
	Basically,  the machine just stops.  No error message 
	what-so-ever.  No error messages in "/usr/adm/unix.log".  
	And there is no pattern to what I was doing at the time.  
	Usually I'm about to enter a command at the unix-prompt.
	It has also frozen during Tape Operations.  I'll notice
	that the tape has been cycling for a long time,  hit
	the Resume key or Shift-Del,  and sure enough, its
	dead.   It has frozen when formatting a tape, with
	the same symtoms (the tape cycles forever).

	BTW: Its not the tape card, as I have taken
	it out since then,  and the machine still freezes up.

What I have done:
	When I power cycle the machine (after one of these
	'freezes'),  it comes up with a screen full of horizontal 
	bars,  and all 4 leds are lit.  The diagnostic disk will 
	not boot at this point either.  Now,  here is the fun part.  
	If I shut it off and 'bump' the machine, (gently hit it), 
	the machine boots up again.  This obviously sounds like
	a bad connection somewhere.....  I've taken apart the 
	machine a number of times and checked all of the 
	cables/connections,  removed them and put them back in
	place,  but the machine still freezes at random times.
    
Has anyone heard of this before?  Any advice on what I should do next?

-- 
Roger Florkowski	       		{uunet!uvm-gen, attmail}!banzai!roger
The People's Computer Company			  `Revolutionary Programming'