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New PSU on old mobo

Discussion in 'Hardware' started by qpzm3, Jul 2, 2009.

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  1. qpzm3

    qpzm3 Thread Starter

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    Hi all,

    I have an old matsonic ms8308e socket A mobo which works with the PSU I have. I have also recently purchased an OCZ StealthXtreme 600W with a view to future mobo upgrade but would like to use with matsonic in meantime as its very quiet.

    Unfortunately when the OCZ PSU is installed the fans run but PC doesn't Post or boot. I've read that some old mobo's need the -5V wire (white) connection to operate. Could this be the issue here?

    If it is the -5V connection that is needed can I just run it to a ground wire (black) connection or to the PC chassis to ground?

    I was using this PC as a project and upgrading over time but any help or references will be greatly appreciated.

    Many thanks.

    gqpzm3 :)
     
  2. win2kpro

    win2kpro

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    Jul 19, 2005
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    11,670
    Yes, an old motherboard may very well need the -5v lead. If the motherboard requires
    a -5v lead, you need a power supply with a -5v lead for the board to operate.
     
  3. qpzm3

    qpzm3 Thread Starter

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    Thanks for reply win2kpro,

    Is there any way to use the newer OCZ with this old mobo, maybe ground the unwired pin18 (vacant white pin).:)
     
  4. win2kpro

    win2kpro

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    No, ground is not -5v. -5v is negative current, just as is -12v is negative current. Current cannot be replaced by a ground.
     
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