I recently replaced my stock CPU cooler on my Athlon XP 2400+. I purchased a Thermaltake Silent Boost, and the installation went fine. I added Artic Silver 5 paste on the CPU. I started the computer and it went into Windows fine. Then I noticed that the FSB reverted back to 100, so I entered the BIOS and changed it to 133. Because the CPU is 133*15 = 2000 MHz. I saved the changes and restarted. Now it won't post, and the Asus reporter gives me a MEMORY ERROR. I have reset the CMOS, changed the sequence of the memory, boot with no sticks, just one stick or the other, try different slots, nothing. I have also taken out and put the CPU back in the socket hoping that would reset something. I can't understand why the computer says there is a memory error. I have been using this memory for the past 1 1/2 years. Please help?