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Windows Thread, APIC Mode in Technical; Anyone know what this is? Having loads of problems with my PC since installing a new motherboard Mobo: ECS Elitegroup ...
  1. #1

    Gatt's Avatar
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    APIC Mode

    Anyone know what this is?

    Having loads of problems with my PC since installing a new motherboard

    Mobo: ECS Elitegroup 865G-M8
    CPU - Intel Pentium D 3.2GHz
    RAM - 1GB DDR PC2100
    OS - Windows XP SP2 (32Bit) or Windows Vista Business (32Bit)

    Problems:

    Vista refuses to install (BSOD - Machine_Check_Exception)
    XP SP2 installs but randomly reboots with all kinds of hex excuses afterwards

    The only OS that has installed fine with no problems is XP SP2 - 64Bit

    Now, I've updated my BIOS, and been looking thru it.

    The only option I can not identify is one called "APIC Mode (enabled)"

    No idea what it is, XP 32bit refuses to boot if i disable it.

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    PeterW's Avatar
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    Re: APIC Mode

    Are all the other bits known to be good and all you changed was your mainboard? Have you run mem test etc?

    Are you using discrete graphics or the Intel integrated?

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    Gatt's Avatar
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    Re: APIC Mode

    Quote Originally Posted by PeterW
    Are all the other bits known to be good and all you changed was your mainboard?
    Yes they were all good - the only problems were with the onboard USB ports on the old Motherboard

    Quote Originally Posted by PeterW
    Have you run mem test etc?
    Yeah Memtest passed all tests

    Quote Originally Posted by PeterW
    Are you using discrete graphics or the Intel integrated?
    What's discrete graphics?

    Have disabled APIC in the BIOS and have installed Vista ok, so just waiting to see if its stable!

    ONly thing now is that XP showed 2 CPU's - whereas Vista now shows 1 CPU - is this Vsta or the APIC thing?

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    contink's Avatar
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    Re: APIC Mode

    Discrete graphics would be a plug in/seperate video card rather than on board graphics chip.

    I was all set to say try the bios when you mentioned vista as that's cropped up for a few folks with some motherboards from what I've seen discussed elsewhere but the SP2 stuff suggests something else.

    Perhaps trying to disable the on board graphics and in fact pretty much anything else on board and then seeing if you can get bits to work as you go along (obviously if you disable the graphics you'll need a graphics card).

    It could be something as daft as a default driver causing the problem or something similar. Certainly it's something my father (who likes to discover problems the hard way) has mentioned with a client machine he had a couple of months ago.


    As to APIC... this is all I could find at short notice:
    http://en.wikipedia.org/wiki/Advance...upt_Controller

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    Geoff's Avatar
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    Re: APIC Mode

    The APIC implementation in the BIOS is probably buggy. See if there's an updated bios available.

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    Gatt's Avatar
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    Re: APIC Mode

    Ok vista is up and running and *touch wood* is stable
    Disabled APIC before I tried the install
    The only thing i've noticed is that Vista is detecting on 1 CPU instead of 2 (which XP did before i turned off APIC and installed Vista)

    Is APIC the Dual Core setting? or does vista just report only 1 CPU anyway?

    @Geoff: Ive already applied the latest BIOS for the mobo - 07/28/2006!! so gonna keep an eye for any newer versions!

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    Geoff's Avatar
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    Re: APIC Mode

    APIC is required for SMP to function correctly. So you'll only get 1 CPU until you fix APIC.

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    Gatt's Avatar
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    Re: APIC Mode

    Thats what I was afraid of - I'm guessing its a fault on the Mobo - may ned to takei t back and get another one

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    contink's Avatar
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    Re: APIC Mode

    Quote Originally Posted by Gatt
    Thats what I was afraid of - I'm guessing its a fault on the Mobo - may ned to takei t back and get another one
    For what it's worth Gatt, there's a number of motherboards reporting BIOS updates required for Vista to work properly so it may be that your board is still pending an update.

    Worth casting around on google for any reports from other sufferers for your board and see if there's anything in the wind.

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