Is the noise a grating type of thing. It could be the cpu fan or the hard drive. disconnect the power lead from the hard drive and try a restart, if no noise then there is the problem.
You dont mention if you have any display on your monitor, if you do, that should give an indication of where its hanging up.
The USB devices dont realy care where they are plugged in. If no display, check the monitor connection, and check for bent pins first (common problem).
If no joy , try source a video card to eliminate that problem. (If pc senses no video out, it wont start usually).
I will think of more to try on next posting.