Never seen this message before!

upon startup today, message appeared on grey screen:

need restart computer. hold down power button several seconds or press restart button.

included french, german , japanese translations of message, , ff:ff:ff:ff:ff:ff

i've never seen message before. know why appear now?

 

about "you need restart computer" (kernel panic) messages
resolving kernel panics
mac os x: how log kernel panic

​

happen regularly? if not, can ignore it.

 

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