hi guys, after some help please. Removed HD from MacPro, installed Mavericks on it using a USB boot install, a USB-Sata cable for the HD, and an MBPro to do the work. replaced boot.efi, changed osinstall.mpkg Upgraded to GT210 video card in slot 4. Getting the boot chimes, but nothing on screen. Do I still need to mac flash the GT210, or should it just work as an Nvidia card? The HD starts, can hear some accessing, and then silence. What should I check first? *** Have removed HD, booted from it in the USB-SATA enclosure plugged in to MBPro. The drive is booting, displaying grey screen, then powering down by itself for one second, powering back up, booting in to Mavericks no problem. So, when plugged in to MBPro it must be powering down for that 1 second too, but not coming back to life - hence why I cannot hear it. Any ideas what might be causing that to happen?*** thanks!