Burnt hard drive controller (Western Digital WD5000KS-00MNB0)

One day I tuned it off and later the computer would not turn on.  I opened it up and my geek son told me to replace the power source.  I did but it still wouldn’t turn on.  Then I disconnted the drives and tried again.  The problem drive is secondary (It has ALL the Music I carefully ripped from my CDs).  when I pulled it out - the computer started right up.  If I connect it - not only won’t it boot - but it shuts down everything and I have to pull the plug and let it sit a while before I try to power on again.  Please help me…I’m the mother of geeks but that’ll only get you so much free help. 

could this be a burnt pin?