I have two partitions both are the same - clones of each other - both running Centos4x

My ESX version is 2.5.4

I went through the process to expand their partitions using the following command:

vmkfstools -X 15g /vmfs/vmhba0:0:0:6/New server.vmdk

(they used to be 10gb in size).

Now when I power on the servers in Virtual Center I get an error:

"A general system error occured: operation failed to change the VM to the expected power state"

What do I need to do to get them to boot?

Thanks!

Mike