@sandeepnd Most probably it's again a dying PSU not providing enough voltage for the HDD to spin-up, it you read this thread you will see that it has been a recurrent problem. We provided instruction in the past posts to check the voltage on the Molex connector. Which country are you located ? Can provide you a link of a good replacement.
Yes you can plug your HDD on any other machine that run Linux, you might need to install mdadm package if not present already : https://wiki.kobol.io/helios4/mdadm/#import-an-existing-raid-array
@bramirez Good to see you fixed it. Out of curiosity when you say update, you mean upgrade from what version to what version ?