I am encountering gray screen while bootin up the OS from the RAID card?
If your Mac OS drive is installed and booting from the RAID card and you experience a grayed out screen during startup, we recommend that you reset the PRAM in your computer. To reset the PRAM, press and hold down the following keys: APPLE + Option + P + R Let the MAC cycle through powering off & back on 3 times in a row then release the keys. For more information on PRAM resetting, see Apple knowledge base http://support.apple.