I have to ask sorry for my bad english, this is not my native language

Then..
I'm trying to help a guy with a dead MoBo.
He tried to install an AMD Athlon XP 2400+ cpu on a ECS K7s5a rev 3.x.
He worked correctly, installing cpu and cooling in the right way.
Did that, he turned on the system. Cooling fans start regullarly, HD spin up, PSU activated. But no video signal, no "Beep code", no ide activity. Nothing at all!!
Then, he controlled all the hardware again again again.... All installed correctly.. At this time, I have no idea of what can be wrong.. I only can suppose that his bios version don't support Athlon XP 2400+.
I've suggested him to reinstall his old processor (amd XP 1600+) and try to boot up. No life-signal from the MoBo, blank scrren, no ide activity..
Then, I've suggested him to reset bios (Amibios, i have no other info about), by removing battery and ATX connector.. Nothing again!!!!!
Hid board is dead..
What can I suggest him to solve the problem?
Does Amibios support bootblock function?
I cannot work directly on his system, I'm giving him help by a forum.
Can anyone here help me?
I'm from Italy, sorry for my bad english



I'm here 'cos this is the best place I've ever seen about bios and MoBo. You're great, guys ^________^
Waiting for an answer, greetings
Dark!