KT6V + sempron 2800 does not boot when BIOS saved

Question

Hi,
I have just bought a new sempron 2800 to be use on a KT6V LSR. I plugget in my KT6V but was not recognised well (but all was working ok with windows). To be recognised, I have flashed with the last bios of MSI my motherboard... and now I have the following problem:
- I clear CMOS, then boot. It comes ok (processor detected and set a 1200Mhz)
- Then CMOS has a bad checksum: I enter setup, then load default, save.
- I reboot: the computer does not boot up.
If I re-clear CMOS I can re-enter setup and modify frequencies or other options. But when I save my modifications, then the computer does not reboot anymore (I have to re-clear cmos again)...
I tried to apply the configuation I found in this thread:
http://forums.amd.com/lofiversion/index.php/t69536.html
It says that SDRAM must be at 333, FSB at 166 and multiplicator at 12. When applying this settings, it does not boot (the leds indicate that the chipset initialisation (the first step) does not pass).
If I just load biios default, the leds indicates that it fails when checking the memory (second step of boot). I suspect that it's a problem of memory (but my memory was working well before !): it's 2x512 of DDR 400.
Any suggestion is appreciated :D . I spent several hours trying to configure the bios but it does not boot..
(I'll also try to find help on AMD forums...)
(Some extra info: my PSU is 26A for 12V, so it seems that it's not due to the PSU (as I read in the FAQ of this forum).
Thanks,
Ptitmain.

Answer 1

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.13um fabrication process
128/256KB L1/L2 cache
266MHz Front-Side Bus
Floating Point logic
AMD PowerNow!™ technology
Less than 6 watt  maybe i should replace my PSU with battery (typical) to 9 watt (maximum) Total System Power Dissipation
Socket A compatibility
3DNow!™, MMX™ and SSE Instruction Set