I believe cold start is the router shut down then power back up.
How come the result from show ver said router had been reload instead of power on?
router1 uptime is 2 days, 16 hours, 55 minutes
System returned to ROM by reload at 23:30:12 CDT Thu Apr 24 2008
When you reload the router using the reload command this is also called a cold restart and the show version shows "System returned to ROM by reload", please check the below document for further details about cold and warm reload: