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Thread: STUPID mistake I made - M1-ATX

  1. #1
    Low Bitrate sxt173's Avatar
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    Unhappy STUPID mistake I made - M1-ATX


    Made a mistake (didn't do enough research)

    So, I have a Pentium 3 (Old Dell system) and a M1-ATX. My problem is that apparently P3 motherboards have two power plugs, one standard ATX and another thinner one. Didn't think about this before ordering my M1-ATX. Newbie mistake!

    So, Any way I can make it work? Any way to rig the MoBo? Seems the thin power slot controls the on/off switch, etc...

    here's a picture of the 2nd #?@&% slot

  2. #2
    Low Bitrate Vacheron's Avatar
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    What this looks like is one half of a very old AT style power connector.
    Early style PCs (286 up to somewhere around the early P2 era) used to have two of these white sockets right next to each other instead of the now standard ATX socket.

    If this really is necessary for the motherboard to operate, then it's certainly not an industry standard for P3 Processors. I have built about 50 different P3 systems and Haven't come across a "half AT" power conector like this before.

    Some motherboards manufactured during the transition from AT to ATX offered both connectors off the board so that system builders could use either style PSU, but I have never seen a board where both were connections were mandatory, especially not in a board as new as yours.

    As the original AT connector had no feedback functionality (not even a soft power on, which was done with a big 230v mechanical switch!), so it may be that dell is just using this style connector as an easy way of connecting all the front panel buttons etc. Could you give us the motherbard model number, or post the relevant information from the manual if you have it? That would help a lot.

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    Low Bitrate sxt173's Avatar
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    Have been trying to look up serials on Here are the numbers I have:
    0007335T-12461-98J-01AJ
    AA 722396-108
    E139761 (had some luck with this - a number that Dell apparently puts on there)

    The MoBo came out of a Dell Dimension XPS (don't remeber specific name). I believe it is ATX size.

    I've also attached some pictures of the MoBo and the power connectors:
    MoBo 1
    MoBo 2
    Power Cables
    (btw, the old PSU was a Dell NPS-200PB serial: 17971-97A-EBYD)

    Thx!

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    Low Bitrate Vacheron's Avatar
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    OK, this is looking promising.

    It may be me just being a bit blind, but I can't seeny of the usual 0.1" jumper headers on that board for connecting the front panel LEDs and power-reset buttons, so it could very possibly be that this is where they are all going to?

    If this is the case, then all you really need to worry about is the power on connection.

    Where does the other end of thet "P7" connector in your last pic come from? Does it come from the case or out of the Dell power supply?
    If it comes from the case, can you trace the wires back to their origin, (or trace the wires from the "power on" button to where they eventually end up?

  5. #5
    Low Bitrate sxt173's Avatar
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    The blue/black wired connector in the last picture comes out of the power supply.

    There is a seperate (standard) pin arrangement for the on/off switch, reset, HDD LED, system LED etc... They just happen to be covered by the IDE cable in those pics -- everything else except for that plug is 100% standard on what you'd see on P4's or AMD's.

    I always thought this 2 plug power system was standard for P3 systems. Just remembered my full system model Dell Dimension XPS-T

    When I plug just the 6 wire mystery side in, the System lights come on and it registers (I guess) on/off signals. If I plug in standard power plug, nothing happens. If I plug both in, then I get a normally functioning system. kinda odd that this apparently wasn't a standard setup...

  6. #6
    Low Bitrate Vacheron's Avatar
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    Quote Originally Posted by sxt173
    There is a seperate (standard) pin arrangement for the on/off switch, reset, HDD LED, system LED etc... They just happen to be covered by the IDE cable in those pics
    Bugger!

    I guess your only option now is to get hold of a multimeter and measure the voltage at each of the pins on that P7 connector when the computer is both on and off.

    All I could think it would be now is perhaps a direct power link to the CPU, like the Pentium 4 - "2 Black / 2 Yellow" Molex connector arrangement.



    edit:

    AHA, Third time lucky! My assumption was correct. It's a 0V / 3v3 Connector!
    All the info you need seems to be here
    (Not good news though).

  7. #7
    Low Bitrate sxt173's Avatar
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    Great! This is what I've been looking for!

    Thanks for all the help

    Will read through article to see if there is a fix, check to see if my MoBo is in deed fried from my experiments and then consider getting a nice little mini-ITX

    cheers

    EDIT: Read thru article, exactly the setup I have (damn!). Well, it's really not worth messing with, just decided to get a mini-ITX like the VIA EPIA M10000 Mini-ITX (is this any good?)

  8. #8
    Low Bitrate Vacheron's Avatar
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    Yeah, put the P3 back together and you can probabably sell it to someone as a package to recover the cost of the Epia.

    I'm running an M10000 (See Signature) and it has performed well above my expectaions. That said, my expectations were realistic!
    (There are always a few who are disappointed because Half-Life 2 ran slowly etc!)

    As always, it depends what you are planning on doing with it.

    I can watch MPEG music videos with Netstumbler, GPS and Navigation software all running in the background without any problems. If this is the sort of thing you are planning to do, then you shouldn't have any complaints.

  9. #9
    Low Bitrate sxt173's Avatar
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    yep, that's it, just all the stuff needed in car. Not planning to duke it out in HL2 while driving

    Ordered M10000, should be here in a couple of days. Btw, guess my old P3 still works! didn't fry it!

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    FLAC IntellaWorks's Avatar
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    .

    Your going to love the M10000... I warn you though... You've taken the next step in to your carpc adventure...

    view this thread if you've got a few minutes...


    Expensive Hobby or what?
    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

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