I removed my hard drive and inserted a new one...then after testing the new one I then re inserted the old one and its failing to start.its giving a following message (type the system password and press <enter>...In inserting my previous password but its refusing
You removed the old hard drive from where?
What kind of testing did you do after you installed the new hard drive?
We're not there, so you need to be more detailed and specific as to what you did.
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