|"the power supply isnt original but i dont think that would matter?"|
It matters a great deal. Did you check these important values:
1). The voltage output of the power supply compared to the original Iomega one?
2) The centre-pin polarity compared to the original Iomega one?
3) The wattage load-rating compared to the original Iomega one?
Any mis-match of the above could damage the drive's internal circuitry.
(Especially too high a voltage or the wrong centre-pin polarity).