Hi, replace the old cpu to make sure everything is working. Make sure the 4-pin cpu power cable is plugged in, normally located somewhere around the cpu socket. Did you remember to unplug the power cord from the PC before installing the cpu?
I have looked at your motherboard on asus's website and this cpu should be supported with your current bios version, but your cpu has 1mb cache memory and the p4 3.0 listed as supported has 512kb cache memory.
So if your PC is working when you install your old cpu, then you can update to the latest bios version, NOT BETA version, then it could work.
That board is listed as supporting Prescott processors. I'd put the old chip back in and boot it back up, and update the BIOS to the latest version, and try the new chip again. If that doesn't work, you might need to test the new chip in a different board that supports 800FSB prescott processors, to verify that it works.