[comp.sys.mac.hardware] Mac IIx shuts down spontaneously

rprohask@orion.oac.uci.edu (Robert Prohaska) (03/22/91)

I've got a macIIx which has taken to shutting itself down, usually 
just as I reach for "save" in the file menu8-).

The machine is about 2 years old and hasn't seen much use until 
recently.  The trouble appeared after installing an extra 4 megs of 
ram (the total is now 8) and adding a wren runner hard disk powered
off the switched outlet on the back.  The switched outlet also powers
the monitor (apple 13") and an imagewriter.  An apple video card is
installed along with a Nuvotech ethernet card.

The machine won't restart for a couple of minutes after is quits, then
it restarts normally and may run for several hours, or quit again in a 
matter of minutes.  When it quits both the cpu and all peripherals go down.

It seems clear the trouble is in the power supply, but does anybody know
of a solution less extreme then simply replacing the ps?  If not, what
is the going price for a power supply and how hard is it to replace?

thanks to all

bob prohaska
physics department
university of california
irvine, ca  92717