Add vm to inventory greyed out

After removing a VM from the inventory of a vmware vSphere 5.5 cluster, the "Add to inventory" option is grayed out on the vmx file. The files are probably locked, as it is "Powered on". How do I add it again and start it?

Thanks!
SekodataAsked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
I'm not quite sure how you were able to remove a Power On VM from the Inventory.

If the add to inventory option is grayed out, it could be the VMX file is corrupted, or it is locked.

If locked you will have to find the process which has locked the file, and remove the lock.

Why do you think it's Powered On ?

Is there a memory swap file present ?
SekodataAuthor Commented:
We had a SAN improper shutdown, and the vm was greyed out as inacccessible. We then removed it from inventory, and now we can't add it again. I think it is "powered on" because there's a vmx.lck file, and the swapfile is present, (3 actually)
SekodataAuthor Commented:
There is also a .vmx~ file present
SekodataAuthor Commented:
It solved itself, suddenly it just reappeared in the inventory (?). Thanks for your response

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