(1)cpu fan error (2)chassis intruded (3)fatal error.....system halted

Do you have the door on your computer case off? Just put it back on or go through your BIOS and find "halt on chassis intrusion" or something of that nature.

http://vip.asus.com/forum/view.aspx?id=20081024173658250&board_id=1&model=P5K-E%2FWiFi-AP&page=1&SLanguage=en-us
http://howsolve.com/2011/09/how-to-solve-chassis-is-intruded-fatal-error-system-halted-problem/
HERE ARE A COUPLE SITES DESCRIBES CHASSIS INTRUDED.AND WHAT YOU POSSIBLE CAN DO ABOUT IT.READ IT CARFULY.

Good day! here's the following steps hope it will help you.

Unplug the computer
Take the MOBO battery out
Remove the chassis jumper
Wait a few minutes
Replace the chassis jumper
Replace the MOBO battery
Plug the computer in

If your case is not setup for chassis intrusion, the motherboard has dropped a jumper.
The location is by the last PCI slot between the CD audio connector and the USB bus plug. (it is right next to the CLRTC jumpers)

Good luck

okae...
first should you do is.. buy a new motherboard.. because like my motherboard, there is no solutions for that error nd problem...tnx

first you have to check the RAM,, then mother board or processor,, ,,, make sure the pc while booting memory check is going with out problem..s

It is unlikely that your CPU is damaged

You need to enter the BIOS and turn off chassis intrusion.

It is an option in the bios that is only useful if you have the switch on the computer case that supports it otherwise it will give you the error you see if enabled

clear your bios, close very good your case, open bios disable chasisis open detected fro yes to no, (or in some model from enable to disable ) change saves exit booting and good work.

you need to go into the bios of your pc.....usually pressing the delete key when you see the first logo screen after booting up....look for a section that relates to errors and what the bios is supposed to do when it encounters an error.
i.e if you see a line in the bios that says "halt on all errors" disable it and when you next boot up the bios will not stall.

I'm not familiar with that particulat model, but I'd guess the motherboard has a chassis switch connector, and senses the chassis be open. Could be because: - chassis open (close it), - switch defect (as a workaround, you could short-circuit it, or just unplug it - whichever solution works for you). As another workaround, you can probably disable this switch in BIOS.