So why did you remove the memory when all you were doing was swapping out the video card and CPU?
Anyway, first thing to do is email ASUS and find out what that particular beeping pattern means. Then you have an idea what is wrong. If you need suggestions on how to proceed from there, you can come back here.
System Information: AMD base Asus A7V8X-X MB, Amd XP2500 CPU, 1GB(2 sticks) Kingston Hyper-X 2700 memory, Antec 400W P.S., Windows XP PRO SP2.
Problem: PC starts, everything comes on, CPU fan, drives, then I get a constant "Beeping". No combination of long or short, high or low, just a continual "beep, beep, beep", and the system will not boot up.
Situation: I'd just reformatted/reinstalled XP PRO, system was working fine. When I tried upgrading the 8x AGP card and CPU a few days later, I removed the memory, the CPU, old video card, then replaced CPU, memory, video card, upon restart got the constant beeping. I've since tried putting everything back as before,and one item at a time. Was told it was a memory problem, so I tried one stick one at time in each of the 3 slots, I've taken memory from working system, used new memory stick in all 3 slots. I also removed battery and cleared the Bios using the jumper.
Am at a dead end on this, Asus data base is of no use. System is lightly used, email, pictures, music, etc. System was working great with no apparent problem after reinstalling XP, now nothing but the "BEEP"-ing beeping.
Really need help getting PC up and running again for my son and greatly appreciate any and all help/information in doing so. Many thanks.