WE have 2 cisco BE6000M M4 ie cisco 220 M4 server for unified communication server (CUCM,CUC,IMP servers).
Power failure happened in the datacenter. both server went down. after powering ON we found three VMs didnt boot up. console screen shows blank screen with "-" blank prompt. its esxi 6.5. There is no other errors or warning or log showing from ESXi 6.5 side. there is no VCenter.
What could be the reason? I tried to boot from recovery disk by setting boot order CD drive as the first order. but whenever the VM restarts boot order changed back to HDD. why this is happening?
UP and down arrow also didnt work while setting boot order. but Plus/Minus button worked. it was in internet explorer 11.5.