VM import using Add inventory?

Hi We are trying to import a vm on a different esx server there are two issues we are facing:

1. First is that when we click the configuraiton tab of ESX server and browse the datastore than we right click vmx file and add it to inventory, after the vm is completely added we try to power it on. The windows server 2008 loading page appears but after that we only see a black screen on its console.
2. Other VMs that have snapshots when we try to add those vms to inventory it gives an error message. VMware “Cannot open the disk ‘XXXXXX.vmdk’ or one of the snapshot disks it depends on.”

Please help.