Acpi compliant computer?

By steeve
Dec 20, 2007
  1. Hi
    I'm running xp which is not powering down after shutdown (I get the old message "It is now safe to turn off your computer"). So I'm trying to find out if my computer is ACPI compliant. When I look in device manager>computer is see two entries which seems strange. One says ACPI Uniprocessor PC and the other Standard PC. Why would there be two entries? The PC is a Sempron 3200 CPU on an Asus K8V-VM motherboard. Any ideas?
  2. Rik

    Rik Banned Posts: 3,814

    Your bios needs to be set correctly, refer to your mobo manual.
  3. Fragrant Coit

    Fragrant Coit TS Guru Posts: 363

    That is ACPI compliant.

    Easiest way to fix it would be go into BIOS and either "Load Optimised Settings" or "Load Default Settings". That ought to do the trick.
  4. steeve

    steeve TS Enthusiast Topic Starter Posts: 146

    Thanks Guys

    I have checked every BIOS setting that I can think of, especially the power settings. And I loaded default BIOS settings. But problem remains. Are you saying that having the two entries under device manager>computer is OK? They seem to contradict each other.
  5. gbhall

    gbhall TechSpot Chancellor Posts: 2,425   +77

    maybe you could take a restore point (just in case) then delete the entry 'Standard PC' and reboot. It is very odd to see two entries under computer.

    also take a look here

    and this might hint at how you got there

    be warned - several similar posts (google for 'acpi computer and standard computer') all warn of the possibility of losing your PC due to loading an incorrect HAL (hardware abstraction layer).

    You could also search your registry for the entry "PowerdownAfterShutdown" make sure the value is 1, although oddly the setting on my PC is 0, yet it behaves normally.
  6. steeve

    steeve TS Enthusiast Topic Starter Posts: 146

    I'm glad you agree about the two entries being strange.

    This particular XP installation does have a chequered history...meaning that better men would have reinstalled long ago. But it does everything perfectly except for the shutdown. (I did check the reg entry which is 1)

    Thanks for these ideas. That first link you posted is pretty comprehensive. I have to say that I've been down the BSOD route enough times to make me a coward when it comes to risky procedures.

    I may build up the courage to delete the Standard PC entry....but I guess I'd like to understand it a little better first.
  7. ravisunny2

    ravisunny2 TS Ambassador Posts: 1,980   +11

    So, turn off the power supply.
  8. gbhall

    gbhall TechSpot Chancellor Posts: 2,425   +77

    Wont hurt to change the registry entry to '0' and reboot. Put it back if no change.
  9. steeve

    steeve TS Enthusiast Topic Starter Posts: 146

    I tried changing the reg entry to 0 but no difference. This computer is set up as a dual boot with XP and Linux. It's interesting that under Linux it does power down automatically.
  10. Fragrant Coit

    Fragrant Coit TS Guru Posts: 363

    I'd try a Repair install - you have nothing to lose, and it may fix it.
  11. steeve

    steeve TS Enthusiast Topic Starter Posts: 146

    In a moment of weakness I did try a repair install.
    It didn't go well. Windows restarted OK after the initial part of the repair. Then when it gets halfway through "installing devices", computer loses power and then reboots. The repair process restarts and gets up to "installing devices" and so we go round and round.

    I saw a few references to this type of behaviour, but would sure appreciate any ideas. Would dearly love to avoid a fresh install.
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