a problem with replacing a motherboard

This is a discussion on a problem with replacing a motherboard within the A Brief History of Cprogramming.com forums, part of the Community Boards category; I'm trying to replace a 486 motherboard with a Pentium 133. The P133 is from another computer that I've recently ...

  1. #1
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    a problem with replacing a motherboard

    I'm trying to replace a 486 motherboard with a Pentium 133. The P133 is from another computer that I've recently upgraded, also. Therefore I'm sure it works.

    My problem is that after installing the Pentium motherboard in the old computer and then when trying to boot it doesn't, instead it shows the famous blank screen. The strange thing to me is that when I put back in the older one then it is able to boot. Anyone have a suggestion of what my problem might be? I was thinking it could be the graphic card, but wouldn't figure it to be the problem.

    Thanks for any help.
    Last edited by lambs4; 12-20-2001 at 03:20 PM.

  2. #2
    Fingerstyle Guitarist taylorguitarman's Avatar
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    What's the rest of the system?
    If a tree falls in the forest, and no one is around to see it, do the other trees make fun of it?

  3. #3
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    I'm uncertain by what you mean by "the rest of the system". So I'm gonna take a guess.

    The 486 motherboard contains:
    A 486SX2 processor running at 80MHz
    16MB - don't know what type

    The 486 system itself contains:
    '93 Trident graphics card
    639MB HD running DOS/Win 3.1

    The Pentium motherboard thats going to replace the above contains:
    A Pentium 1 processor running at 133MHz
    81MB SDRAM SIMM
    '94 Trident graphics card

    I don't know if this would be help, but maybe its the type of motherboard: P5I430VX250 Explorer

    I hope the above leads to a solution to my problem.

  4. #4
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    Any beep at POST?

    Any other sounds (like the RAM counter)?

    Remove all the components except the graphics card , processor and ONE mem stick. See if it will POST then. If it does add components.

    Check the power supply is compatible. Some of the 486 had different power needs but I thought that was only the 486DX 4 100.

    Remove the battery on the motherboard for a few minutes to reset it to the fail safe BIOS settings.
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  5. #5
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    I thought that was only the 486DX 4 100.
    My typo. It is a 486DX. I'll take your suggestions and try them within a months time or so.

  6. #6
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    Originally posted by novacain
    Any beep at POST?

    Any other sounds (like the RAM counter)?

    Remove all the components except the graphics card , processor and ONE mem stick. See if it will POST then. If it does add components.

    Check the power supply is compatible. Some of the 486 had different power needs but I thought that was only the 486DX 4 100.

    Remove the battery on the motherboard for a few minutes to reset it to the fail safe BIOS settings.
    One mem stick may not cut it, most older motherboards have bank sizes that are either 2 or 4 SIMMS -- so unless he has a full bank, all filled with the same size modules, he won't get anything.

    I take it both cases are AT form factor? Make sure you're not shorting any part of the motherboard to any metal part of the case.

  7. #7
    train spotter
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    Yes, I forgot.

    486 is probably 4 if it is not faster than 33.
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  8. #8
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    Check the processor. If they're different, the machine code (which is what all the programs will get reduced to) could be referring to registers that don't exist. It's sounds like an older processor and won't have systems that the Pentium it's been set to has.

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