I recently had to re-partition and re-format my pc, after it crashed while running, and would not boot up. After re-installing windows xp, my pc boots up fine. However it will only boot up at around 1ghz, It is A 1.4Ghz and that is what I have allways run it at. The corevoltage it set to 1.75. When I enter cmos to change the speed upto 1.4, and save changes the machine reboots but seems to hang. The cd-rom just flashes like its trying to be read. I reset and try again, same thing. I can go back into cmos and change the settings back to 1ghz and the pc will boot up fine and load windows, but will not at 1.4? Is there any reason why this could be happening? Any help you can provide will be much appreciated.

So before it crashed it was running at 1.4ghz but after you re-formated it started doing all this? you didn't do anything else, like clear the cmos? if not maybe you should try that..if it still don't work i have no clue what's up with it. maybe someone else will have a better suggestion.

You cpu runs at 1.4g = 133mhz fsb x 10.5 multplier

if the motherboard has a kt133 (but not kt133A) chipset, its normal for it to fail at 133mhz but not at 100mhz. No idea why it used to work at 133mhz, unless you have only now gone to winxp and used to be on win98.

Thanks guys for your replies, That's right after it crashed and failed to boot, I partitioned, reformatted then reinstalled xp, that's when the cpu speed problem began. I did not clear cmos, however I've been playing with testing the memory, there fine, ran scandisk from dos on both my partitions and there are no bad sectors and no errors reported however after replacing the memory and rebooting the pc it seems to be running fine again, at 1.4 at 133mhs. However it appears during my re-installation of xp some minor errors occurred, which will require a fresh installation, I think I will reformat both partitions again, run scandisk and defrag inside dos, before installing the software just in case there are any bad sectors the first check did not pick up on. The inside of my case is rather dusty that may have been the problem, but I doubt it.

Thanks again for your replies

To be safe you might do the install at only 100mhz to minimize the chance of any hardware-caused installation problems, then switch back to 133mhz once winxp is running clean

Yup, I'd do as johnoh suggest in response 4.
Insure you install mobo drivers after format.
I know you aren't stupid but crap like this is easy to forget when you're thrashing on your machine. Lost a large drag race purse one Sunday because I staged with a quart of gas in the tank.