While powering on the serve it getting the error.
Error:Power On virtual machine VM Device 'Bootstrap' is not available.
What was leading up to it? Did you restore it, migrated from VMware Workstation or copied from another ESX/ESXi server version or anything similar?
As a first step I would suggest creating a new VM with the same settings and attaching the problematic VM's disks to it and see if it helps.
I'm assuming the ESXi host has a lock on your VM's thereby causing DRS to fail too - Also the ESXi hosts in question is probably in Maintenance Mode
run this.....on your ESXi host
esxcli vm process list
You'll see VM info
World ID: 4728889
Process ID: 0
VMX Cartel ID: 8595510
UUID: 42 2e bf 0c 1f ff3 cf 26-50 f0 86 d7 22 79 45 2f
Display Name: yourvm-name
Config File: /vmfs/volumes/Datastore- UUID.....etc/yourvm-name.vmx
esxcli vm process kill -t=soft -w=<your world id> - in this example 4728889
After this command it should release the VMX "lock" process & you can power on the VM using your Web Client
I had the same issue, which turned out to be Windows Hyper-v being turned on during an installation of another program.