I'm thinking the culprit is with the mobo (Intel DP35DP) but one of the intake fans is giving me fits:

Intake 1 fan: Corsair 120mm 3pin red LED
Intake 2 fan: Arctic P12 PWM 120mm 4pin

First, made a mistake and ordered a 4pin fan but got a 4pin splitter so no problem hooking both up to the 4pin header.
Initially the Arctic was only running at 650rpm while the corsair was more than twice that. So switched connections
on the splitter and now the Arctic won't even show up on the bios/intel utility but seems to be blowing fine. Speedfan
also won't acknowledge it either. Any suggestions would be welcome.

Note: tried the corsair fan on a 3pin header elsewhere on the board and it runs but the red led flickers. Like I said , this
board I got even though it was NOS could be a POS.