Burned floppy power cable.

I connect the IDE and the power, and procede to power up the machine...<SNIFF, SNIFF> What's that smell?? Holy cow, there's smoke!! And before I know it, I've burned the power cable going into the floppy! Well, after an autopsy of the cable, I noticed that I plugged it in with the left connector not connected to anything. So connecting 3 of the 4 connectors will short out the connection...
i cut out the burned section and insulate it with insulator tape.
The PSU is working fine.

LOL, you didn't JUST connect 3 out of 4 pins, you connected either your 12v (yellow) or 5v (red) wire to GROUND! And yes, that shorts out the wire to the GROUND wire and burns it.

Your power supply is probably fine. If you want you can chop that cable and try splicing in another.

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