System locks before memory test

I'm trying to put together a system from some spare parts I have lying around.  I have an ATX motherboard using the Intel TX chipset and AMD K6 PR-233 CPU that came out of a Polywell system.  I also have 4 16MB EDO SIMMs.

I put the motherboard in a new ATX chassis, with my old Matrox Mystique PCI video card and a floppy (no hard drive yet).  It worked for a few minutes, but after I hit the reset button, it stopped
working.

Now, it will display the video BIOS message, the BIOS version, and detect the CPU.  But, instead of starting the memory test, it just hangs with a blinking cursor.

I tried running with just 2 SIMMs (I tried both the 2 that originally came with the system, and the 2 I added later), but it didn't change anything.

All these components (except the case, power supply, and floppy, which are new) had worked together in the same system for years.  They've been on the shelf for a few months, though.

Any suggestions?
cjmAsked:
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mark2150Commented:
Any beeps?

If no, then CPU is getting hung.

Does it work Ok if you turn it off and let it cool down?

Video BIOS message is generated by vid card itself, no MB CPU involvement required.

Main CPU is sick/DOA.

M
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cjmAuthor Commented:
> Any beeps?
no

>Does it work Ok if you turn it off and let it cool down?
no

>Video BIOS message is generated by vid card itself, no MB CPU involvement required.

But I also get the main BIOS message (BIOS manufacturer and revision numbers and CPU type).  Doesn't that involve the CPU?
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cjmAuthor Commented:
Would there be any point to turning it on after removing the memory or CPU?  Or any other tests I could try?  (I don't have another motherboard that could accept the SIMMs or the CPU.)
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rayt333Commented:
Are you sure you have the jumpers set correctly for your CPU?
You may try resetting the CMOS to default and trying again, remove the battery or move jumper to erase the CMOS setup
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RoadWarriorCommented:
I would try running the CPU slower, if it doesn't make it past that point at a significantly lower speed, (set the bus speed low as well as the multiplier) then there is a serious problem with either CPU/Mem/Cache or chipset.
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RSPARCommented:
Have you checked for bent pins on the cpu?  When you took the memory out did you use the correct bank?  Is your voltage set right for the K6?  CPU are pretty durable smoking one is fairly rare.  Make sure it's installed right, cut corners matching.
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mark2150Commented:
No beeps and no memory check says that CPU is failing POST. Post checks CPU registers and instructions and THEN checks memory. If it's stuck on the way into memory test then it's got to be failing CPU test.

Yes, I would expect BIOS signon to be generated by CPU on MB, but that doesn't do any "higher" functions. Simple integer stuff can be ok but higher math and floating point sections could be bad. This will let the CPU sign on and then die during POST.

So all of the checks you've been given. Voltage, Jumpers, Bent Pins, Orientation, Memory. Finally, change CPU.

M
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cjmAuthor Commented:
First of all, I got this motherboard and CPU as part of a system from Polywell.  It was in regular use until about 2 months ago when I put a new motherboard & CPU into the original case.

I just bought a new case and tried to put this motherboard in it.  The CPU has never been removed, and the jumpers/switches have never been changed.  I just double checked, and they are still set properly for a K6 PR-233.

All of these components (except case, power supply, and floppy) were in daily use in the same system for about 3 years, so I know they're compatible.
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rayt333Commented:
Well then was they stored in a static free area in the static free packaging? if not maybe a charge burnt something out.

What about the power supply in the new case?

If everything worked before but not now then look at what is different first
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rayt333Commented:
What about a ground for the MB
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bparnesCommented:
What you don't know is whether it is compatible with the power supply. The PS could be delivering voltages that are just out of range for proper functioning of the MB/CPU. You also could have gotten one or more chips unseated with all the "messin' around" you've been doing with that MB. It's also possible that you haven't mounted the MB properly in the chassis so that one of the mounting screws is making improper electrical contact with the MB. The one thing we know we can't blame this on is Microsoft.
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mark2150Commented:
What occurs to me is that there may be a mechanical short under the MB in the new case. Did someone forget the fibre washer under the brass standoff?

M
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wombat29Commented:
It coud be that you have put the ram in the wrong slots. You have to put the Ram chips in to a set order, either one in each bank, or fill one bank up before you start on another
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wombat29Commented:
It coud be that you have put the ram in the wrong slots. You have to put the Ram chips in to a set order, either one in each bank, or fill one bank up before you start on another
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cjmAuthor Commented:
Well, I set the jumper to clear the CMOS like rayt suggested.  I meant to just leave it like that for a few minutes, but I got distracted and it stayed that way all day.  When I switched the jumper back to normal and turned on the system, everything worked.  (I only had 32MB in it at the time.)  I've since installed the remaining 32MB, hard drive, network card and sound card, and it's still working.

I don't know why clearing the CMOS would have any effect (the CPU type  etc. is set with jumpers and DIP switches), but it's working now.  Thank you all for your suggestions.
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cjmAuthor Commented:
An Excellent!! answer would explain why this had any effect. :-)  But thanks anyway, at least it's working.
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