i tried mountain lion then mavericks in this laptop before, and it last more than year without a problem. when yosemite 10.0.0 niresh is available, i tried it also but failed, it stucks to bluetooth keyboard. then i reformat my hd to 1 partition only and install mavericks again but this happen now.
i cant install mavericks and yosemite now. while mountain lion successfully installed but needs a usb flashdrive to boot.
any idea? my bios firmware is the latest,i also use the old firmware and crack but still no luck.
please help. ty
my laptop ins fujitsu ah531 8gb ram