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Thread: Very Strange Problem (kinda long)

  1. #1
    Maximum Bitrate MikeHunt79's Avatar
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    Very Strange Problem (kinda long)

    I while a ago I had a problem with an old system of mine: It wouldn`t POST, so i tried loadsa stuff, and re-seating the ram got it to work. The system is a p200mmx on a asus tx97 motherboard, with a 32mb dimm.

    Anyway, once i got it working after re-seating the ram, only 16mb of the 32mb would work. It would even show 16384k on the POST screen. I accepted this, as I was just happy that i`d got the system going again.

    It gets wierder: Yesterday, I blew the keyboard fuse on the motherboard while testing a homemade keypad. I noticed this because the keyboard wouldn`t work, and I tried more than one keyboard. The strange thing is that the motherboard would now show 32mb of the ram on the POST screen! Wtf? I would like to know if this is fixable, as it would be nice to have all of my ram and a keyboard, and not one or the other.

    Anyway, I got another fuse now, & i`m about 2 solder it on the motherboard, but i`m expecting to see 16384k on the POST screen again.

    I havent the faintest idea whats goin on here, so any input is appreciated....

  2. #2
    Maximum Bitrate Skippman's Avatar
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    Sounds like you've blown a voltage regulator or cold solder trace. It's possible that when you shorted the system the second time it might have refused the broken cold solder trace. That's the only thing I can think of.
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  3. #3
    Maximum Bitrate MikeHunt79's Avatar
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    ahh, ok... Thanx. I don`t think i`m gonna be able to fix that. Hopefully the mb will hold out till i get a replacement...

    The keyboard fuse is definately blown... I've unsoldered it now, and i`m about to replace it. It should get the keyboard going again.

  4. #4
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    maybe the psu was no good and you were under powering the system.. once you stopped feeding power to the ps2 port you freed some up for the ram.

    That may be a long shot. But that's all I got.
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    Maximum Bitrate MikeHunt79's Avatar
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    Again, thanx. Hadn`t thought of that, but this system is for the house, so i`m using a beefy 250w supply, so i dont think power is a problem. I have also tried more than one PSU, all with the same results. It's also an old AT board, which has the 5pin din plug for the keyboard....

    Anyway, i`m gonna stop posting now, as the soldering iron has heated up...

  6. #6
    Maximum Bitrate MikeHunt79's Avatar
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    Damn, I can`t get the keyboard going at all.... I just put a new keyboard fuse in, and that one blew as well.

    Something is definately up with the motherboard. I can`t get a new motherboard for a while, so i`m gonna have to borrow a usb keyboard off someone i know (i`m not gonnna see her till friday tho).

    I just hope I turned usb on in the bios, otherwise i`m screwed, unless theres someway of installing windows without a keyboard?

  7. #7
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    Sounds to me as if the keyboard BIOS chip is fried. I've never heard of anyone fixing that. If USB keyboard support is disabled in the main BIOS, I fear you've got a new doorstop.

    I believe you can install Windows in an "unattended" mode... "silent install" may be what it's officially called. It's for IT guys who need to install a bunch of identical operating systems.

    Of course, if the motherboard won't POST because of the dead keyboard chip, you can't do the install...

    Sorry none of that is actually any help.

  8. #8
    Maximum Bitrate MikeHunt79's Avatar
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    Everything helps. The motherboard does POST, and it even tries to boot.... I must have "halt on: no errors" set in the bios.

    If I could somehow do this "silent install", I would be happy, as i`m just gonna use this system to record minidisks and be a firewall..... I could get away with just a mouse, i think.

    Also, if it is the keyboard bios chip, I might be able to replace it, as i have a few dead motherboards about the house, that i could use 4 bits... hmmm, anyone know what a keyboard bios looks like?

  9. #9
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    This page and this page seem to tell how to do it. Looks like you could use that Batch 98 utility to make a msbatch.inf file, then burn it onto a custom Windows 98 setup disk. You should be able to boot off the CD and run an automated setup.

    I haven't tried it, though.

  10. #10
    Maximum Bitrate MikeHunt79's Avatar
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    ok, thanx.... i`ll give it a whirl

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