I have a space walker 637 version 2. I had a celeron 266 in there and it worked fine. I just got a celeron 300a and tried to install it. I got it installed but when i start up, it says ---- mmx 450mhz. (it actually has the -). What is going on? I tried to lower the bus speed from 66mhz to around 40mhz, but i got the same result.