Hi Mouhamah,
yes tried that. i was able to disconnect the host, but that didnt change the vm state - they were still "disconnected". i was sure the host was disconnected, because i coudl then go 'right-click' on the host, and the option to 'Connect' was there. (but given host was down, it obviousy wouldnt connect)
also you can see it in the screen shot that the host has 'disconnected' next to it
comments?
[edit: if it helps we're running (dont laugh) ESX 3.5 and vcentre 2.5)