How to reset a chassis intrusion switch
This little thing is a chassis intrusion switch. Some computers actually use these annoying little things. You open the hood on your PC, tinker a bit, put the cover back on and the computer has the nerve to tell you that there has been a chassis intrusion, and it will not start, go into BIOS or anything, even if you unplug the damn thing.
On most mainboards you can disable the switch by putting a jumper across the two pins the switch is connected to. Simply follow the leads from the switch to the connector on the board. Then bridge the pins with a jumper. If you don’t have any jumpers, you can get them at any computer shop.
To reset the warning, you need to reset your BIOS. You can do this easily by unplugging the computer and popping out the BIOS battery (sometimes called a CMOS battery) It’s almost always a CR2032 and is usually attached to the mainboard in a little holder with a metal clip and will probably look like this. Pop it out and wait maybe 10 minutes. Then put it back in. Remember that the positive side goes up on most mainboards. The warning should go away, and if you disabled to switch, you’ll never see it again.
You will have to reset your clock (the battery keeps it going too). This can be done from the operating system. Most mainboards have decent default BIOS settings, but on some you may have to go in there and change a couple of things to turn on or off features you like. You can learn all about that here.
Do they actually put these on newer computers these days, or is it something found only on older computers? From what looks to be a case lock above the switch, I’m assuming this pic is of an older case.
I’ve seen several older computers, (mostly HP Desktops,) with BIOS support for a intrusion switch, but never one actually in use. I’m wondering if this was a optional feature, or if some tech like yourself got annoyed with the thing and removed it.
Comment by Michael Campbell — 2009/3/2 @ 13:16
A lot of mainboards support the feature, but you tend to find the actual switch on business machines. Compaq used to love the things.
Comment by cobolhacker — 2009/3/2 @ 18:56
thanks a lot, mister !!!
Comment by Anonymous — 2009/4/5 @ 07:26
[...] I think it has something to do with BIOS. though i’m not sure. See here : http://www.fixya.com/support/t194425…_cable_needing and here : http://www.cobolhacker.com/?p=840 __________________ If nothing else works, open command prompt and type ‘del C:Windows’ [...]
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