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Hey guys, I swapped my 780 Ti to a 980 thanks to EVGA's Step Up program. It has arrived today, and after installing it, the laptop won't turn on. I pressed the power button, the Sonnet III-D and the GPU light up, but there is no boot-up chime from the MacBook at all. This is what I have at the moment: Late 2013 rMBP with 750M EVGA GTX 980 with ACX cooler Seasonic M12II EVO I'm trying to get this sorted, I've already done a clean install and if I get this sorted I'll let you guys know. If anyone has any ideas I would gladly appreciate your help!! Update (3rd December): The following has been done so far: - Removed the EFI partition on the SSD. It made no difference. - Transferred the 980 into my old eGPU enclosure: Sonnet SEL with an unpowered riser. It boots up 60-70% of the time and works a treat on both Windows and OS X when it does. This is currently my setup. - Used a friend's old GPU (XFX HD 5770) on the III-D. Laptop makes it to the boot screen and boots up. GPU is recognised as "Display" in OS X. Therefore, there wasn't a problem with my III-D, and the problem is not due to the dGPU and the eGPU having a different GPU architecture/brand (in general). - I used another friend's 2011 MBA with the 980+III-D setup. The laptop booted up with no issues. NEW: I have tried hot-plugging my 980+III-D combo as soon as the Apple logo appears. Still not working as usual, but now System Profiler actually acknowledges the existence of the card (i.e. it shows up as GTX 980) More observations: - Another user, Torsten, reported a similar problem with his 970, another Maxwell card. His 970+SEL setup boots up 20% of the time. He has a 2014 rMBP with the 750M dGPU. - The only 970/980 + III-D setups that have successfully worked with no issues so far involved MacBooks with integrated graphics only. This includes the EVGA ACX 2.0 model that both I and Torsten have. entzoe had his EVGA 980 ACX 2.0 working on his III-D with is Iris Pro only rMBP. Conclusion: There is an issue with rMBPs with dGPUs booting with the new Maxwell cards (980/970), especially with the Sonnet III-D, where it doesn't work at all.