Hi there- A single bad SIMM in the proper location could very well cause
all the problems you have listed.
Ben Hood wrote:
> Hi All.
>
> My friend was given a 486 motherboard, together with 2 CPUs and 4
> SIMMs. Unfortunately his current computer is an IBM 386SX, and
> doesn't accept standard motherboards. So we've tried the 286 case I
> had lying around.
>
> We managed to get the motherboard in the case (fairly nicely; most of
> the holes even matched up :) And hook up the power cables to it. The
> motherboard is very good looking and jumperable to different CPUs,
> with a VLB bus and 256k cache RAM.
>
> Anyway, we didn't have any other cards, so we put the video card from
> the 286 in (ISA VGA one), and all the SIMMs.
>
> Turning the power on resulted in a blank screen. So we double checked
> all the connections (eg power, video lead etc) The only card that was
> in there was the video card, so I tried it with a serial card and IDE
> card with floppy drive (also from the 286). All this produced nothing
> on the screen. (except the flicker indicating power is coming down
> the video cable [the monitor takes a separate power point]). [I did
> test between each change]
>
> So I tried more things, like different SIMMs, all the different
> combinations and perumations I felt was enough. Tried the other CPU.
> I even fooled with the jumpers [there was a nice table printed, so I
> tried likely-looking values from that]. Setting the CPU voltage to 5
> volts [vs 3.3V] made the chip fairly warm so I knew there was some
> power getting to it.
>
> My friend had talked to the person who gave him the board, and he
> said the motherboard was working perfectly a few days before; he was
> just getting rid of it because the lowest computer he now has is a
> PII. He also said that one SIMM might be damaged.
>
> I checked the voltage coming from the power supply. They were all a
> little low, being 4.9V, -4.9V, 11.8V, -11.7V, 4.8V, etc. I don't know
> the needed order of these voltages, but they seem sensible. The black
> wires were in the middle, as they were in the 286 board. (Tested with
> a high quality Fluke multimeter)
>
> So, does anyone have any ideas at all? He is an arts student, but
> wants to learn more about computers. :)
>
> PS: As I think of it, we hooked up the speaker, and there was no beeps
> or anything. The Turbo button and LED seemed to work.
>
> Thanks in Advance for any help or suggestions.
>
> (The next problem is getting something more than the 40MB harddrive ;)
>
> --
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>
> CONAN! Watch out for that quicksandaOo+XU+ NO WARRIOR
>
> * PostHaste and Arachne
>
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remember
4 LEGS GOOD, 2 LEGS BAD!
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