I have installed a second hardrive in my mbp using the optibay. Since then ive been trying to install windows on the second harddrive, but it wont boot from the windows cd. After some testing, it turns out it wont boot -any- cd from an external cd/dvd drive. When i put in a bootable cd and boot with the option key, it does recognize the cd. When i select it, it starts spinning up, stops, and i get a grey screen with an flashing apple/failed sign. I have already tried the following: - Reset PRAM - Use the superdrive i removed as USB cd/dvd drive - Use a different USB cd/dvd drive - Tried to boot off a bootable USB memory stick - Installed rEFIt boot loader. - Tried the (USB) superdrive on a previous model 15" MBP, and it boots without problems. Im at a loss what else i can try. OS X installed perfectly when the superdrive was still connected to the internal SATA connector, but i dont feel like switching the whole thing back. Not to mention i wont be able to install windows on the secondary drive. Maybe i could try an ExpressCard SATA controller? Or would that be a waste of time/money? Im also considering installing through target disk mode, but im afraid ill run into all kinds of trouble. I hope you'll have some ideas!