God, so much details missing here i don't even know where to start..
Have you restored an old xml-backup to another server?
Describe in as great detail as you can (preferably more than 11 words) and we will do what we can to help.
Not forgetting to *read the logs* - they should tell you what is going wrong. Try atlassian-jira.log first and catalina.out if there is no jira log.
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