I had the same problem when I overclocked me 2.4 P4b processor, even 1-3 mhz over the original FSB.
1. Find the person or company you bought the computer from and ask if it is overclocked, request to underclock it back to the stock speed.
2. You can manually underclock it if you know the original FSB or you can change the multiplier, this will void any warranty on the computer though so I don't recommend it unless you can not recontact the distributer.
Take a note on paper of each of the numbers before you change them, so you can change them back if anything goes wrong.
Change the PCI frequency. Get into BIOS (Hold DELETE at startup) and under the select the top left option (differs from board to board). This should bring you to the System speeds screen. There should be a line saying PCI Frequency or PCI Speed and there will be a "/3" after it. Change this to 33 MHz, press ESC, F10, Enter. Your computer should restart and retest your connection. If this solves your problem, stop reading. If not, Go back into the bios, same screen, change the divider to /3 and change the FSB to 200 if it is over 200 and 133 if it is between 200 and 133. ESC, F10, Enter. Retest.
If this does not work, just go back and change the settings back and contact your local computer store for more help. They will overcharge you to change a few numbers and actually get the thing working, but it will work.
P.S. Maybe you just dont have enough ram in your new computer?