System reboots with a new larger hard drive

I have an older Celeron 400mhz systemboard, currently with 2 hard drives, I tried to add a larger hard drive (40gb) so i can back up the files off the 10gb and the 4gb, but my system would just keep rebooting.  I could login, and get the desktop, but then it would just reboot.  Safe mode didn't help any either.  Any suggestions?
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I would update the BIOS and then install the disk.

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I agree with Mcscotsman, some older motherboards didn't add support for drives over 20gigs until later.  Does it identify the drive correctly (right size) within your Bios?
NstyDevilAuthor Commented:
after i got home last night, i was thinking about the problem, and how the post doesn't see the drive unless i limit the drive to 32gb.  and even then the system was rebooting all the time... so when i get home i will try the bios upgrade.  that will be the fun part, finding a driver for the old m/b
That mb isn't THAT old- come on.. But if you have trouble finding an update, let me know and I'll try to help.
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Windows 2000

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