VMware has become aware of some ESXi 4.0 hosts experiencing a purple screen after vCenter Server is upgraded to 5.0read the original KB (follow for further update)
The Knowledgebase Team has prepared KB article: ESXi 4.0 Update 2 hosts may experience a purple screen after vCenter Server is upgraded to 5.0 (2007269) and an alert has been placed on the Support page to alert customers of this issue.
This Knowledge Base article will be updated if new information becomes available (you can subscribe to rss feeds on individual KB articles for this purpose). If you have been affected by this, please read the KB.
We apologize for any inconvenience this may have caused you. If you know how to spread the word to your friends and colleagues, please do so.