New processor giving me audio error is it me or processor?

(POSTED THIS IN ANOTHER THREAD BUT FEARED IT MAY NOT GET READ) my apologies)

HI yeah just been reading all this with great interest as its the closest posts ive seen to the problem im havin

My pc worked and does work fine first using 601 then 1204 bios on an m2n4-sli board I updated it using the tool and though the verify came up with an error the machine still boots up fine, but the reason I updated the bios in the first place was so that I could run another processor which id got AMD Athlon 6400+ x2 64 the black edition but both before I flashed the board and after I get the same problem on trying to boot up an audio code consisting of 1 long then 2 short beeps but if I re-install my current processor it works again fine any1 have a good idea whats wrong here?

Unsupported processor
Corrupt bios 1204
incorrect bios settings (how do I fix this?)
fault with mobo
faulty processor ~(this is what I beleive already)
video adaptor fault
other


From reading around the fault would appear to be occuring because of either a video adaptor problem or psu problem but my machine works perfectly well with my old processor AMD 5200+ x2 64 and the video card has been recently replaced my psu is a hiper 670 watts which I dont think is the problem

Thx in advance

Bios 1204 was 601
M2N4-SLI
AMD athlon 5200+ x2 64
Windows xp pro 64 bit edition
4gb 667ddr2 memory
BFG Gforce 8800gtx PCI-E 768mb ddr3
Western digital 80gb hdd IDE
Maxtor 250gb SATA hdd
Samsung 750gb SATA hdd
3x fans + cpu fan + gfx fan