FSB Overclock, Computer shuts down after 15 sec

Hello All,
I'm putting together a computer together with the K7N2 Delta board for a friend of the family. It's a XP2800 chip, with a PNY GeForce Fx 5800, and 256 Crucial mem. Here's my prob:
The processor wasn't running at full speed so I went into BIOS, changed bus speed to 200MHz. It obviously should be set to 166MHz, which I learned later. I was successfully able to set the jumpers for the bus speed back to Safe Mode at 100MHz and then boot back into the BIOS. Now my problem is that the Motherbaord doesn't stay on more than like 30 secs without shutting off and the only way to restart it is to kill AC power to the board. At which point, start it again and the process repeats itself.
Does this mean I fried the board and CPU? I sure as hell hope not
Thanks
Lue

Ok:
Power Supply is 400W max output, it came with the case.
PNY GeForce FX5200 128MB DDR
Crucial 256 DDR2100 Ram
Standard Floppy
LG CDRW
Sony DWD+-RW
WD 120 Gig Hd
WD 40 Gig Hd
SB Audigy2 MP3
The computer WAS working with everything in it. Loaded XP pro fine, did initial driver installs. Then I went into the BIOS and set the buss to 200MHz. Then the problems start.
Now, I also checked the CPU fan cause I saw other articles were the CPU was overheating and shutting the computer down. I booted the it up and went into the PC Health in the BIOS and watched the CPU Core temp go to 45 celcius before I turned it off. Could it be the comp is overheating and shutting down?
Thanks again
Luke

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FSB Overclock, Computer shuts down after 15 sec

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