I have a problem

with a a7n8x dlx. and the athlon xp 2600+.
at 1st it just worked fine, i was able to install all software and i got no problems.
i ther realized that the cpu was working at 1100mhz. i set the clock to 166, (so i can get the 333 with the 2x mult. ) ant the mobo simply refuser to post afterwards.
i tried to clean the bios over a milion times, i took the mobo out of the bos and set it up on an isolated surface, i replaced the gfc card, ant the memory sticks. btw. i am using Kingston 256mb DDR333 sticks.
can somebody help?
i have tried everything i know, and i wont get a ph*** post. X|
thanx