Yesterday i did an update on my macbook. After the update the system normally starts again, but mine didn't i waited for 20 min and came to the conclusion that i have to hold down the power button. after that i started again and i got a flashing question mark folder. So i took my SSD out ( vertex limited edition) and put my old HDD with snow leopard in to see if i connect the SSD externally if it would show up but it doesn't i took another HDD case but this also didn't work. So i also tried putting my ssd in the macbook of my sister but this also didn't work. I am clueless, i don't know what to do. I still have warranty but i have new data since my last back up and i really would like it back.