Under Islam, Is There A Precise List Of Haram Problems?

 NO.

Explaining haram?  Well...generally, anything that gives you pleasure and can be identifed....is on a list of things called haram (meaning you should avoid).

Example....if you had a bicycle and rode it to chill-out/relax....it would be on a haram list.  If you rode it strictly to reach work....it would not be haram.

So there cannot be a single precise, exhaustive, or universally agreed-upon list of everything that is haram.

There being things on one haram list....by one group...involving technology or medical stuff....being 'bad', but if you were a different group member....it'd be on the good list?  Yeah.

Magic-BS or fortune-telling?  Usually on the bad list.  Same story for gambling or bribery.

Sexual matters?  Well....it depends on the leadership interpretation....some might suggest being happy after sex....being a bad-thing....while another group would suggest being happy in any form....being a good thing.

All of this leading to confusion?  At some point....when folks ask enough questions....things get to a point of making little sense.

Engaging in a discussion with a Muslim guy on haram, and trying to make sense?  It's not likely to make sense.  Even the Muslim guy will admit it.  

In the end....to make public perception positive....it's always wise (if a member of this group) to say you are always unhappy....no matter what you are doing, and just fake it.