Well, I solved my own problem. The 486 had (I can't believe I did this) the
RAM installed backwards. It wasn't fully in so that is why it fit the wrong
way. I found the CPU on the other motherboard wasn't in all the way. It is
purring away right now, loading Linux.
Wayne Harris
> Good evening. I have a problem with a computer not POSTing. It is a
> 486/66, and /or a Pentium 166 (I have 2 motherboards) I originally was
going
> to upgrade to the 166, but ran into problems.
> The 166 tested out fine with just the motherboard, 166 chip, 32M of
RAM,
> and a video card attached to an extra power supply (no OS). It posted fine
> and I got a display on the monitor. The hard drive spun up and it sought
the
> floppy drive ok. That was as far as I had tested it.
> I then tried to install it into my AT case. I did not get a post, I
did
> not get a monitor display, the hard drive spun up, and it sought out the
> floppy. I tested another known working monitor and it still didn't
display.
> I replaced the 166 motherboard with the 486/66 motherboard (and another
> video card) and it did the same thing. A note to say that when I
> disconnected the video cable from the video cards, I did get a raster
(on
> both of the monitors).
> My next step was to drag the motherboards out of the case, in case
there
> were any shorts, and still got the same thing on each motherboard.
> The only things I seem to be left with are bad P8/P9 connector
voltages,
> or bad RAM. I can't believe that both motherboard RAMs are bad, so I
> suspect the plugs are bad. I can't get to a meter until next Monday, so I
> was wondering if anybody out there had any ideas of anything else I could
> try before next Monday rolled around. Also does anybody know the voltages
> from the P8/P9, and what pins have what?
> Thanks Wayne Harris
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