EDIT: Bad title but I could not edit title after posting, I realize this is more a RAID card issue than a graphic card issue i work for an audio/visual company and we are converting our 2010 MacPro into a video editing/projection mapping show computer. When I was hired, the Mac had a Quadro 4000 installed. Wanting more outputs while still being to use it as a editing machine, we installed a K5000. This gave us four outputs. Wanting to dedicate those four outs for projectors, I kept the Q4000 just for the local monitor. While a bit over kill just for a monitor out, it meant we didn't have buy another card. Everything has been running fine until the other day, I turned on the computer and the internal RAID was not showing up. Launching RAID Utility gave a message "waiting for apple RAID card." Disk Utility is not showing any of the drives, I would expect to at least see the drives listed, just not in RAID formation. A few thoughts came to mind, power overload, dead card or dead battery. As far as power is concerned, everything I've read about dual GPU's in this model Macpro says it shouldn't have a problem. The way the PCIE slots were configured: Slot 1 - K5000, max watts is 122, PCI gives 75 and aux gives 75 Slot 2 - Q4000, max watts is 142, same power in as the K5000 Slot 3 - black magic deck link mini recorder, est. watts about 10-15 Slot 4 - Apple RAID Card, 26 watts So I should be within limits power wise. This leads me to a dead card or battery. Does an Apple RAID Card not work at all with a dead battery? Quick way to tell if card is dead? EDIT: I have Yosemite installed Any help/comments are appreciated! Hope I explained the situation well enough.