PC can't be shut down with new mobo

[DVI]

I've encountered a problem with my new P4S800D-E Deluxe motherboard.

The problem is that my PC can't be shut down. When I want to shut down the PC -- BOTH with Windows XP Prof SP1 AND with the power-switch of my PC (more than four seconds) -- the harddisks stop, the monitor turns off, but all fans keeping turning, the DVD-drives can still be opened, and the power-led is still lit. It seems as if the PC turns to a standby-mode.

This problem also exists when I want to switch off the PC with the power switch BEFORE Windows has started, so this is not a software problem.

Before, my PC functioned correctly. I upgraded my motherbord, processor and memory, and after that the problem arose for the first time.

My configuration:

Motherboard: Asus P4S800D-E Deluxe
Processor: Intel P4 3.0 GHz
Memory: 2 x 512 MB DDR400 CL2.5 Kingston Valueram
Prim Master / Slave: 1 x 200 GB Maxtor / 1 x 60 GB IBM.
Sec Master / Slave: NEC 1100A / Pioneer DVD-Rom DVD-116.

I performed some checks:

* All BIOS-settings are default, and seem to be correct (Power Button Mode=On/Off, ACPI Support=Enabled, etcetera).
* The power switch of the case functions correctly --> I can turn on the PC, and besides that: temporarily using the reset-switch as power-switch has the same effect.
* Having no IDE-drives connected doesn't solve the problem.
* Using only one memory module doesn't solve the problem.

Does anyone know this problem, and what can I possibly do to solve it???

 

[Peter]

Recent mainboards have a BIOS adjustable power button behaviour. You can set that to "Power on/off" or "Standby". Check that.

 

[DVI]

That's OK, it says Power On/Off.

 

[Buz2b]

I realize you mentioned trying the reset switch as the power switch but another idea might be to remove the wires from the power switch and try "shorting" the pins with a screwdriver to turn the system on, then off.
Second, remove and reinstall the ATX power cable to the MB, making sure of a good tight connection. Another idea would be trying a different Power Supply, if you can get your mitts on one.
Since you mentioned checking the BIOS settings already, I think one prudent idea would also be to re-flash the BIOS. Perhaps there is some corruption there. BTW, did you try setting the power switch (in the BIOS) to the opposite of what you want? Sounds weird but stranger things have happened. Set it to go to Standby, reboot and try it. If it does as it is supposed to (suspends) then go back into BIOS and reset back to on/off. Also, did you check the setting for what state (on, off, standby) to return to after power loss? That is a separate setting from what we've discussed on some BIOS.

 

[boomerang]

I've seen similar situations that were cured by a BIOS flash. To the previous version too.