I had the same problem. --> you've to update the BIOS vwith version 1201.
On my M2NPV-VM i had an athlon 64 3200+, i changed it with Athlon 64 X2 BE 2350. After the change my system remained off for a week.
A week later, when i tried to start the system... all that come was a long-short-shor beep.
I tried to swap the ram between slots and nothing happened.
I removed the power cord and the BIOS battery. I had reset the CMOS shorting the right pin on the Mainboard.
It started only once byt i was able to see that my BIOS version was the oldest one (ver. 303) and that tha CPU was recognised as UNKNOWN AMD ATHLON PROCESSOR.
I found on ASUS website that ATHLON 64 X2 BE 2xxx is supported only in the last BIOS version.
You have 2 choices:
- You ask someone for one of THIS cpu (supported by the oldest firmware 303), do a swap, flash the BIOS and reswap with your CPU.
Sempron 3800+ (CN),256K,rev.F2,62W,SocketAM2 ALL 109
Athlon 64 3000+ (CN),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 3200+ (CN),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 3500+ (CN),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 3500+ (CW),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 3800+ (CN),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 3800+ (CW),512K,rev.F2,62W,SocketAM2 ALL 303
Athlon 64 FX-62 (CS),1MBx2,rev.F2,125W,SocketAM2 ALL 303
Athlon 64 X2 3600+ (CU),512K,65W,rev.F2,SocketAM2 ALL 303
Athlon 64 X2 3800+ (CS),512Kx2,65W,rev.F2,SocketAM2 ALL 303
Athlon 64 X2 3800+ (CU),512Kx2,35W,rev.F2,SocketAM2 ALL 303
Athlon 64 X2 3800+ (CU),512Kx2,65W,rev.F2,SocketAM2 ALL 303
Athlon 64 X2 3800+ (CU),512Kx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 4000+ (CS),1MBx2,rev.F2,65W,SocketAM2 ALL 303
Athlon 64 X2 4000+ (CS),1MBx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 4200+ (CU),512Kx2,rev.F2,65W,SocketAM2 ALL 303
Athlon 64 X2 4200+ (CU),512Kx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 4400+ (CS),1MBx2,65W,rev.F2,SocketAM2 ALL 303
Athlon 64 X2 4400+ (CS),1MBx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 4600+ (CU),512Kx2,rev.F2,65W,SocketAM2 ALL 303
Athlon 64 X2 4600+ (CU),512Kx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 4800+ (CS),1MBx2,rev.F2,65W,SocketAM2 ALL 303
Athlon 64 X2 4800+ (CS),1MBx2,rev.F2,89W,SocketAM2 ALL 303
Athlon 64 X2 5000+ (CU),512Kx2,rev.F2,89W,SocketAM2 ALL 303
Sempron 2800+ (CN),128K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3000+ (CN),256K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3200+ (CN),128K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3200+ (CW),256K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3400+ (CN),256K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3400+ (CW),256K,rev.F2,62W,SocketAM2 ALL 303
Sempron 3500+ (CN),128K,rev.F2,62W,SocketAM2 ALL 303
- second choice (the one i did).
Use only one stick of RAM.
Download the BIOS vers 1201 and AWDFLASH.EXE form ASUS site.
Make a bootable floppy and put the 2 files on it.
Connect a floppy drive to the mainboard (it supports 1.44 MB on default CMOS settings) and put the bootable floppy in.
Try to reset CMOS (power cord/battery/short pins) until the system starts once.
If you're not able to start the system, retry moving the RAM in another slot: first yellow/first black slot.
After several times of CMOS reset my system went UP and i was able to BOOT form the floppy, starting the AWDFLASH and programming the BIOS with the lastest version.
Eureka !!!
After this operation the system was working fine, no more beeps or whatever else from the mainboard.
Look at the mainboard manual for the correct reset CMOS sequence .
Sorry for my english, i hope this can help you.
DaryL74