crwdns2934241:0crwdne2934241:0 Dan

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Here’s another reference: [http://knowledge.seagate.com/articles/en_US/FAQ/185311en|Macintosh Beep Codes]

See if you can recover the EFI and SMC firmware using these:

* [https://support.apple.com/kb/DL1714?viewlocale=en_US&locale=en_US|Mac Pro EFI Firmware Update 2.0]
* [https://support.apple.com/kb/DL1724?viewlocale=en_US&locale=en_US|Mac Pro SMC Firmware Update 2.0]

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open