You got the following error when powering on a VM:
Unable to Power On virtual machine with “A General System error occurred: Internal error”
An issue has been uncovered with ESX 3.5 Update 2 and ESXi 3.5 Update 2 that causes the product license to expire on August 12. VMware is alerting customers and partners of this issue. VMware regrets the inconvenience caused to customers. Updated product bits with correct licensing will be made available for download as soon as possible.
This seems to affect initial VM power-on (including from suspended state) and VMotion.
On the VMTN forum there is a thread post about this problem, check it here
VMware has created a KB article:
Unable to Power On virtual machine with “A General System error occurred: Internal error”