I replaced 5 stock fans in my Antec 1200 case with Thermaltake IGCS 12 fans. The ones I hooked to my mobo work fine. The ones I hooked to the 4-pin molex lead from the PSU (Kingwin 1000W) don't spin. Other fans (the old Antec ones) spin fine off that PSU lead. Again, the Thermaltake ones that don't spin DO spin when connected to the mobo 3-pin headers--just not when connected to the 4-pin molex. And the molex lead does successfully power other fans. Any thoughts?