Apple OS X Yosemite 10.10.3 Supplemental Update

Apple OS X Yosemite 10.10.3 Supplemental Update questions & answers

The OS X Yosemite 10.10.3 Supplemental Update fixes a video driver issue that may prevent your Mac from starting up when running certain apps...

Alternative downloads

MacBook EFI Firmware Update
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The MacBook EFI Update will update the EFI firmware on your notebook computer.
iMac Graphics Firmware Update
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MacBook Air SMC Update
2.0
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Addresses and issue that causes battery drain various MacBooks.