Why won't my computer POST when I change the multiplier

I have an AMD 2400+ and the L1 bridge is closed. I've read people were having great success running this chip at 333Mhz FSB. But whenever I change the multiplier from anything but AUTO the computer won't POST .  This is weird because right now it's 15 x 133Mhz
I tried 14,  12.5/13 without changing anything else and the computer won't POST , I have to clear the CMOS with the jumper to get the computer to boot up.
Any ideas?
Here's my specs
2. KT4VL
3. 2002 11 15
4. New Brunswick Canada
5. Radeon 9700PRO p/n 1029420612 064450 (p/n says ver 1.2 sticker on bag said ver 1.0)
6. Buit by ATI
CPU: AMD 2400+ XP (2.0Ghz clock)
RAM: 512 Megs DDR Samsung 400Mhz CL3
PSU: 431 Watt EnerMax
PCI-1: empty
PCI-2: empty
PCI-3: SounBlaster Live Value
PCI-4: 56k modem
PCI-5: 29160N SCSI controller
PCI-6: empty
IDE1M: LG 52X CDROM
IDE1S: empty
IDE2M: empty
IDE2S: empty
BIOS : Tried Bios version 1.1 and 1.4
Loaded High Performance settings then changed
Boot sequence to 1- floppy, 2- SCSI 0 , 3- disable
Boot other device to "no"
Disabled COM2
Disabled IDE2
Disabled on board sound
Enabled 6 USB ports
AGP aperature 64MB
Core Frequency 133Mhz
OS: WinXP + SP1
via drivers: 4.43
tried DX8.1b and ati driver 6193 PASS
tried DX9 RC0 and ati driver 6228 RC0 PASS

ok i found what pins to short to unlock it .
I was able to run the chip at 333FSB but my 400Mhz ram wouldn't run at 400 only 333 regardless if I forced it or not.
Sandra memory benchmark increased over 400MB/sec but 3dmarks2001SE was not stable and I lost over 2200 points. Many screen abnormalities and the occasionally freeze. SO I reverted back to the original settings which are fine with me.
I just wanted to hit 15000 on 3dmark for my personal satisfaction I guess it won't happen . Thanks everyone for your help

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