[Solved] System does not like my molex connector

I have these same 4pin molex to 3-pin harness connectors in my other PC to daisy chain multiple fans. I am trying to connect a side fan atm for a different PC.

Truthfully the 4pin molex is coupled with a 3pin(actually only 2pin) harness connection for added fans. I daisy chained from the molex powering the DVDROM to the molex harness to the 3pin fan via the 3pin(2pin) connector. When i do make the connection the computer will not post. I d/c and reset, and the pc will post.

I decided to give a single fan its own molex connection. Same thing happens, the pc will not post. D/C and reset and get a post.

The fan runs the whole time it is on the splash screen, but it just sits there w/o posting.....

I do have a second harness i can try, but that is just awkward a single fan halts the post....

I have a 600w OCZ modXstream psu. I dont really need to post other info since the computer works

The computer has been on for more than 48 hours and I have been running stress tests and playing different games w/o any problems. This single fan is the only issue!

Edit: All the mobo fan connections are full btw, hence the need for the added harness.
Any ideas?

Try a different fan.

Yes, I know you said the works. But, ... try a different fan.

I booted up , all fans connected. Hanging at splash screen. I unplugged side fan and used a different one. PC posted and i d/c'd fan and resintalled both fans to there respectful spots during loading screen. Hit the reset button. PC posts and all fans running great! Oh well, it worked. Thanks for the help!

Best answer selected by BroHamBone.