When the floppy light stays lit as soon as you turn on the PC, that indicates that the floppy cable that goes to the motherboard was connected backwards.
Unlike IDE cables which have connector guide notches and a red stripe on the cable to help you make sure you get it in the right direction, the floppy is easy to reverse. Check that first.
I would wonder why the person who had the PC previously was messing with that connector...
~cdogg
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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