HGST, HITACHI drive Ready but cannot ID, ABORT error after HEAD Replacement

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I have these 2 drives
1. HITACHI
HTS545025B9A300
250GB

2. HGST
HTS721010A9E630
1TB

They both were having clicking heads
I changed the heads
Upon turning on they got Ready
And as soon as i click into any utility to ID the drives
I got the Abort message

What can be the cause of this problem???
And how can i fix this??

Does PC3000 have any articles about it??

Thanks!!