I did some searches and tried adjusting the bios but this motherboard won't shut off.

My first thoughts was APM but you can't even hold the power button to turn it off. The only way to shut it completely off is to pull the power cord out.

Other than this problem everything else works fine.

I've tried different cpu's, different ram, different operating systems...

Tried clearing bios and reset to default then Optomized, changing APM settings with no change.

You power down 2k or xp or even linux it just hangs like it's waiting for something. I can hold the power button forever with no result. Though I can press reset and it does reset.

Is this a bios issue? Trying to keep from flashing bios as a last resort.

Thanks for reading
Chad

MSI K8N Neo
AMD Athlon 64 3200+ @ 2.21ghz
1GB DDR 3200
nVidia 128mb FX 5200
WD 120gb SE
NEC ND-3500AG DVD R/RW

Try removing the battery for 10 minutes to reset back to default, then see if that helps..

The ACPI support of the mboard chipset is what determines how Shut Down, Standby, Hibernate, and sometimes Restart work. The drivers for and/or information about the ACPI support is included in the main chipset drivers. Whatever operating system you use, if you don't load the main chipset drivers after it's Setup is finished, your ACPI support will probably not work properly.

Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, and hard drive controller support. If you have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often do not have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.

Settings in your bios Setup also affect how your ACPI support works, but the main chipset drivers must be loaded.
If you're not sure if you have those settings right, you can do as Ghostman 1 suggests (it takes less time to clear the cmos if the AC power is disconnected from the case/power supply, or load bios defaults.

"...you can't even hold the power button to turn it off."

That's determined by a setting in your bios Setup. Many bioses have that set by default to turn off the computer after holding the power button in for about 4 seconds, but your bios is not set that way.

Try deselecting everything in the msconfig startup tab. Reboot and then try shutting down. 'If' that works, use the process of elimination to determine which application in the startup tab is failing to close down properly.

Do you have the same problem were you to shut it off before it goes into windows? Like maybe booting to dos or booting with a CD or using F8 to get the menu so it'd pause? If so then it's not anything to do with the OS.

Even when a motherboard seemed dead but the PSU was running I could shut it off by holding in the power button. So I wonder, could that method of shutting it off be a function of the PSU itself and not the bios? If so your problem may be with the PSU.

Or maybe the power switch is only making intermittent contact and you're not getting the full 4 seconds. You could test this by removing the power switch wires from the motherboard and shorting the contacts with a jumper or the tip of a screwdriver. You'd have to do this while it was running. Then if it shuts off you know you have a problem with the switch.

For what it's worth. The motherboard handles the power on and power off functions itself, without the assistance of the Bios or CPU.

I think i'll try another power switch first then remove the bios battery 10 minutes or more.

I think it's the motherboard and not OS related since you can't hold power button and make it shut off.

MSI K8N Neo
AMD Athlon 64 3200+ @ 2.21ghz
1GB DDR 3200
nVidia 128mb FX 5200
WD 120gb SE
NEC ND-3500AG DVD R/RW

" think it's the motherboard and not OS related since you can't hold power button and make it shut off. "

"I think i'll try another power switch first then remove the bios battery 10 minutes or more."

It's extemely unlikely there's anything wrong with the power switch. If it turned on the computer it's fine. It only on when pressed.

Removing the bios battery some more will not help.

Did you read this in response 2?

That's determined by a setting in your bios Setup. Many bioses have that set by default to turn off the computer after holding the power button in for about 4 seconds, but your bios is not set that way.

I know what setting your talking about as I have adjusted it before in other computers I just don't see it or am missing it on this computers bios. I don't know if it's phrased differently or what.

MSI K8N Neo
AMD Athlon 64 3200+ @ 2.21ghz
1GB DDR 3200
nVidia 128mb FX 5200
WD 120gb SE
NEC ND-3500AG DVD R/RW

It's plain as day if you had bothered to look around enough.

Tyan S1834 a.k.a Tyan Tiger 133

There is no support for Socket A and older mboards on the current Tyan site, but I found some on an ftp archive site that has older manuals.

6 Manuals and one added page for your mboard model is here:
a_s1834_120.pdf - a page for mboard version or revision 1.2 - a for Addendum
6 manuals or parts of manuals - m_s1834.xxx for mboard versions or revisions 1.0, 1.1, and 1.2
ftp://ftp.mathematik.uni-marburg.de/pub/mirror/tyan/manuals/
(all of it on one line)
e.g. m_s1834.100.pdf - see pages 52 and 54 of the pdf.