Motherboard p3v4x : during bootup i get a system

Hi,
This error is usually caused by an incorrect setting of either bus speed or multiplier (or sometimes processor chip operating voltage). These could be set either by software ie in BIOS or by changing tiny switches mounted on the motherboard.
Have you consulted your motherboard manual?
Try here: http://www.motherboards.org/files/manuals/1/p3v4x-102.pdf
or try the ASUS website and look under support or the discussion forums.
This will help: http://support.asus.com/cpusupport/cpusupport.aspx

These freq and voltage settings are set under BIOS which is usually accessed by hitting the DELETE key on your keyboard after turning on your computer.
Sometimes a quick fix is to enter BIOS as per the above instruction and selecting LOAD BIOS DEFAULTS or something similar to that and then save and exit BIOS and allow the computer to reboot.. That may get you to the point of booting up without the improper freq comb error.
If you have no luck playing with the above info, shut down your computer and remove the left hand side cover on your computer box or tower, so you can access the inner workings of your computer.
Remove the cooling fan from your processor chip. It will be a large square or circular (black or silver colour).
Take a look at your processor chip. Note the part number printed on the chip, which is only visible after you remove the cooling fan. For example it may say for example SL52P or something else. It may also be an AMD chip.
Search the internet for its specifications ie search for SL52P.
For example, if it was a Pentium 3 chip running at 800 Mhz go to google and search for specs of P3 800 Mhz processor with the part number SL52P.
Google returns the following info (based on the example above) of:
http://processorfinder.intel.com/details.aspx?sSpec=SL52P
ie its a chip that runs at 800Mhz speed with the memory running at 133 Mhz (800 mhz processor speed obtained by having the multiplier set to 6 but actually means the memory is running at 133 MHZ but the processor running at 6 times the speed of the memory bus ie 133x6=800 MHZ (one of the settings you need to get right in your BIOS settings)
So if you had this chip, in BIOS you would select 133 bus speed, with the multiplier of 6 usually locked down on the processor physical internal wiring.
If your BIOS doesnt allow you to play with the processor and memory bus settings (commonly done to make the processor overclock to a faster speed) the other option is that you have the DIP switches on your motherboard set to the wrong settings. Again, refer to to your motherboard manual. The DIP switches are tiny plastic switch blocks on the motherboard with a row of (usually) white sliding switches.

Intel chip info: http://www.intel.com/p/en_US/support?iid=hdr-AP+support

http://processorfinder.intel.com/List.aspx?ParentRadio=All&ProcFam=483&SearchKey=

Also Try this: http://processorfinder.intel.com/Default.aspx

Cheers,
Steve (Melbourne, Australia)