Deleting the lock file is only going to help if the problem is that you were already running a Jira and a new attempt to start a second one was made, and you forcibly kill one or both of them to get back to a clean start system.
You should do that anyway - try shutting down all Jira systems that might be running on the system, making sure you check your process monitoring to ensure that it is competely gone (service stopped in the service manager, and check the running processes to check there are no java processes running)
However, if a totally clean restart does not work, that is not the cause of the problem. "Startup check failed" does not tell us why it is failing - you'll need to read further up through the log to see what is provoking that.
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