i have a macbook that is currently running leopard and vista by bootcamp, a few weeks ago when i booted up and went to select my mac os, the screen wouldn't come up, power on > option > and then nothing, no choices of HD's just a blank grey screen, i've tried everything to get mac up and running (vista works fine), after many failed attempts, i decided to just erase everything and start over. so, i went to reinstall tiger, then leopard, then bootcamp, then vista, but while i was trying to install tiger about half way through it will just stop installing and say, a error has occurred, installation failed. so i restarted the computer and tried two more times and the same thing just happened again. i called apple support and the woman i was speaking to couldn't help me, she was only telling me things i already knew. please help. thank you. by the way, this is not a new computer, nor new software, and it has all been used before and i've never had this problem until now.