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Hardware Thread, Low 3.3 voltage in bios in Technical; Hi people, Just wondering whether anyone could answer this! I have a machine that stops on its post checks and ...
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    FatBoy's Avatar
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    Exclamation Low 3.3 voltage in bios

    Hi people,

    Just wondering whether anyone could answer this! I have a machine that stops on its post checks and says "Hardware monitor error found F1 continue DEL for setup". If you press F1 it boots to windows fine but if I go into the bios and look under power management I find a low 3.3 voltage reading. It hangs around the 2.97v mark and doesn't change.

    My questions are
    1. Does the 3.3v come directly from the power supply (Therefore needing to replace it) or is the 3.3v scaled down on the motherboard from the power supply and the motherboard isn't doing its job properly?

    2. Would it do any harm just pressing F1 and carry on using the PC until the power supply/MOBO dies?

    Thanks a bunch
    FB

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    SYNACK's Avatar
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    It's the PSU, you could damage your data by the machine being unstable or possibly damage some of the internal components like the capacitors on the motherboard by putting to much strain on them. If its a desktop you could use a PSU tester to make sure that it is not the sensor that is faulty but this is hardly ever the case. There is a tollerance for lower or higher power in the circuts but given the difference it 'may' cause damage continuing to run it like this. It could also mean that you need a more powerful PSU if you have recently added new hardware and the existing one can't cope.

    There is the aditional concern that when the PSU goes it does not do it quietly pulsing a large surge down the 3.3V line and frying your whole system.

  3. Thanks to SYNACK from:

    FatBoy (12th March 2009)

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    Michael's Avatar
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    I agree, it does look like a PSU issue. Just to be sure, restore all BIOS settings to default. You can pick up PSUs from about 10 upwards, so it's not really expensive.

  5. Thanks to Michael from:

    FatBoy (12th March 2009)

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    FatBoy's Avatar
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    Cheers peeps pretty much what I thought just needed a bit of backup on the issue

    Thanks again

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