yesterday my iMac 5K with Sierra 10.12.2 reboots from it self and after reboot the iMac will not show my Pegesus2 R4. I tried to switch of the R4 but it does not shutdown during is pushed the powerbutton so I pluged of the powercord. After I pluged in the powercord the R4 will not seen in the finder and the power-LED is amber and all drive activity LEDs are flashing blue....
Is there anyone who can tell me what to do now? I waiting now more than 12 hours, because I thought that the R4 maybe rebuild... Its very important for me to loose no data from system, because there are many photos and backups on the R4.
Thanks for your help!