Raid logs are not going to do you much good unless you have some defunct drives.
If all your drives are defunct you could use the event logs at the end and try forcing the drives back online in the reverse order that they went down in. Meaning the last drive to go defunct would be the first drive forced back online. You can force all but the last drive in an array online. Once that is done, provided the OS is not corrupt, the system should boot up.
Of course not knowing why your OS is not loading this is all speculation and informitive.