Computer still beeps on startup even after replacing almost every component?

A friend of mine gave me a computer that wouldn't boot, first i got the message system32\drivers\ntfs.sys missing or corrupt. I was able to replace it from an xp disk then i ran chkdsk /f to fix any errors on startup. I would see the emachines logo then once it went away, 2 short beeps, 3 long beeps, followed by a long pause and 1 more beep. I unhooked all drives, removed all pci cards and 1 memory stick. So i just had the motherboard, processor, and 1 ram stick connected to the power supply and I still got the same beeps. I replaced the motherboard, processor and ram with components from another working system. Still beeped on startup, I then replaced the power supply and still get the same number of beeps. The funny thing is the computer will boot to the desktop and works fine (after copying ntfs.sys from the disk) but I still get the beeps even after replacing the mobo, ram, processor, and power supply. I've tried it with the hard drive unhooked, i've disabled shadowing, caching, and cleared the cmos on both boards. I'm pretty sure I've covered every angle but obviously something is still wrong. As I said the computer will boot to the desktop now but i get the beep code at startup (beep beep, beep-beep-beep.......beep. The computer uses AMIBios but I can't get any help from them.