Chassis Intruded! System Halted!

[WildGoose]

I get this message on initial startup, stops the boot and does nothing more, if you reset the computer after this it boots normally most of the time (other times it will give you options to play with the bios or boot in safe mode), but the bios date and time are all screwed up and it wont remember it if you set them correctly, also only certain date ranges are available.

Using the computer, now the date and time are messed up and need resetting in windows every time you turn on, there is also an issue with most websites, IE complains about security certificates.

Mobo is an Asus A8N32 Sli Deluxe. Searching for Chassis Intruded System Halted, leads to lots of Asus issues, but not a lot of it makes any sense to me, as its quite geeky speak.

This is a fairly recent thing, and I haven't done anything differently, apart from often turning the computer off at the wall, as it hangs on shutdown, which is a common XP problem rather than a hardware problem as far as i'm aware. I'm vaguely wondering if I might have fucked something always turning it off at the wall. Or whether motherboards need some residual supply from the wall when not in use over a while.

Any thoughts?
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So in other words, he stopped you for being flagrantly in posession of a motorcycle in direct contravention of the Hippies, Darkies and People Whose Face I Don't Like The Look of (Police Powers) Act. 1976

[tsmith]

cmos battery flat?

plug a network cable in and XP will shutdown.

i think there may be a chassis intrusion jumper on the motherboard but if you haven't changed anything it won't be that setting

[TQ]

I'd put money on it being the CMOS battery.

To put your mind at rest you could check you don't have a chassis intrusion sensor, open the case and it'll be obvious if its there. If it is just disconnect it from the mother board (or turn it off in the BIOS).
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First Bike :Gilera DNA 50 | Second: Imported 1989 NSR125
Third: 1998 Yamaha XJ600N | Currently: 1999 Yamaha FZS600

[Frost]

Clock reset is a big give away that the CMOS isn't holding power, likely due to a flat battery, possibly due to some other failure. CMOS battery is probably a CR2032 so easy to replace.

[WildGoose]

I take it that if I open it up I would see the CR2032 easily?

I built this PC myself in 2006 and cant remember ever seeing the small battery. Though I wouldn't have been looking for one at the time.

[EDIT]

https://images.bit-tech.net/content_images/2005/12/asus_a8n32-sli/overview.jpg

On the left there I assume that is it? Just pops off does it?
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So in other words, he stopped you for being flagrantly in posession of a motorcycle in direct contravention of the Hippies, Darkies and People Whose Face I Don't Like The Look of (Police Powers) Act. 1976

[Frost]

Yup big round silver thing on the left half way up. The left hand side has a clip that you pull back to pop it out. It will say on it what it is. Most large supermarkets will stock a replacement.

[Tarmacsurfer]

I spend far too much time in Dear Aunty.

I was expecting this to be a post about someone's girlfriend when I opened it.
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I'm immortal. Well, so far.