If it actually worked before you plugged it all together then you probably didn't short anything that you shouldn't have.
If it worked with the new HDD then there should be no compatibility issues.
If the serial number is within the recall range then I would suspect that you have a faulty logic board - covered under the replacement programme. This seems to be an all too commmon fault. The symptoms seem to be that the ibook boots to Chime but no video output on laptop screen or (importantly) on an externally connected screen.
You really need to get it checked over professionally.