1) yes ive bent pins on a cpu but mine seemed to keep working. you just have to bent them back to the proper position carefully
2)please explain yourself, i dont understand y u have to put something between the mobo and the case. The parts of the mobo wehre you put the risers do not conect ot the circuitry.
3) read Norcent comment. since your motherboard worked and your cpu had bent pins, i guess it might be the cpu.
<img src=\"http://img467.imageshack.us/img467/6756/mysig1cn.jpg\" border=\"0\" width=\"454\" alt=\"Image Hosted by ImageShack.us\" /></a>