Installed new psu now 2 of my hard drives wont power up

I have 2 seagate barracuda 7200 500 gb sata hdd that wont power up... what are the odds of two hdd of the same model going bad at the exact same time? I have 2 other seagates that are working just fine and a crucial ssd that also is working just fine.

Can anyone help me plz?
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  1. Ok, so i figured out what happened. No instructions + removable cable system + me = hooking that sata cable into the pcie and flowin to much juice into them, thus fryin the connector cards. Where can I buy just the power cards at? and can I pcb them into one of my other hd till i get it fixed?
  2. See http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

    ... and http://www.users.on.net/~fzabkar/HDD/ (photo clips)
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