Hello, I have a P3B-1394 motherboard and everytime I go to startup my computer it shuts down after about 2 secconds. Then I start up again and it continues to load as normal. I am running Win2k and my bios right now is 2004 beta 4 (the newest I think) It also did this with the 2004 bios. My computer DOES shut down as normal with no problems. I checked the all the wires to see if there is a connection problem and I even changed the power supply. I tired e-mailing asus about a month ago with no answer. I also searched the newgroups and still no answers. I was hoping someone here might and an idea on what is wrong. PLz help if you can. By the way I am not a computer newbie. THX for yout help.
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Asus P3B-1394 motherboard w/ 333 Celeron
Gullimont Geforce 256
SBlive (X-Gamer)
Winnov Vidium Capture Card
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I've had the same problem on an EPOX VIA MVP3G2 motherboard. It turns out that it is a power supply problem on my end. When the system boots, power is sent to ALL the fans, cards and drives in your system to initilize them. If this goes over your power threshold on your power supply, it forces a reboot. I started having this problem after adding a CD-RW drive and SEVERAL more cooling fans to my system. If you've got a lot of hardware under the hood, I wouldn't recommend anything less than a 300W power supply. Now if you have an ungodly amount of juice off your power supply, I don't know what to say. But try adding up the wattage usage of your hardware and you will probably see that you are over the limit. I hope this helps!

Try unplugging all extra PCI/ISA components and boot with just vid card. Might be one of your extra cards.

Tried it.