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  • A 3.5" drive requires more power, than a 2.5" drive, normally the laptop should be able to provide this power, but given that your laptop was already failing, it may have been failing for the same reason as why you had to connect additoinal supplies. Normally, a 3.5" drive should be powereable by the cable.
    – LPChip
    Commented Jan 14, 2019 at 16:46
  • @LPChip I think you misunderstand, The laptop works fine and this was 2 years ago (it still works), it was the 2.5" SATA drive that was failing, but even with the laptop power supply connected it would not power the 3.5" drive. This was also an HP business laptop (HP Probook 6550B) not a cheap consumer level laptop. After my replacement 2.5" SATA drive arrived I cloned the 3.5" drive to the new 2.5" drive and continued using the laptop and still do to this day.
    – Bja
    Commented Jan 14, 2019 at 16:58