This weekend I spent some time fixing my computer. Suddendly it had minus 256 MiB memory, not good. At least a good reason for its oops (since friday...). Opened it, pressed the ram's modules against its slots, everything working again, memtest runned for hour.
Used the computer hacking as a excuse to update its BIOS (screw up by screw up...). Fine! The computer stopped completely. After deeply breathing, I cleaned its nvram and everything went just fine. Nice, 3 mhz gain (!), the bios updates never tell you the real truth. I love tweakable's bios.