How can i get my motherboard booting up again?

the beeps are the mainboard giving diagnosis, and the number of beeps, long and short should be listened to and recorded, ie. 2 short beeps & 2 long beeps. given this information, either yourself or someone here can tell you what the problem is.
here you can see for yourself...
http://www.computerhope.com/beep.htm

Andy
April 2006

Well, socket 478 is a Pentium socket, not AMD, the AMD socket is 462.
Well make sure all the wires are properly connected and the memory pushed in all the way

Wang
April 2006

Beeping early in the boot sequence is a real problem. Assuming that you have told the whole story, the only thing that you touched was the battery. Check that you have reinstalled it correctly.

The moral is: use proper dagnostic techniques don't poke and hope.

Terry
February 2006