MB/PSU problems!

[UmbraSprite]

I have a Asus Striker Extreme and a Thermaltake 850 PSU.

When I connect the main power to the MB it powers up fine but the other power cable I am using out of the PSU to run my water cooling pump, lights etc do not. Now using the same power supply and completing the circuit with a paper clip everything works fine.

Any clue as to what I am missing and why I get no power out of the same connection when the main is in the MB?

Its a pretty big problem since powering up the MB with no pump on to run the liquid cooling gives me oh what 5 seconds to fried chip!

Help much appreciated! Thanks!

 

[Seekermeister]

My first guess would be that the PS is overloaded with everything trying to run. Test all rails with a DMM.

 

[GalvanizedYankee]

Are you sure that the polarity is correct at the water pump?

 

[UmbraSprite]

Would seem strange to me that the MB and one MCP 655 pump would overload an 850W PSU.

What do you mean by polarity? Would it change from when I have the paper clip competling the circuit to plugging the PSU into the MB?

 

[biostud]

maybe it need some load on the cable? if there are more connecters on the cable try to plug one into a harddrive and one into the pump.

 

[UmbraSprite]

No luck still.

Still nothing with the MB plugged. I did use a paperclip and ran three hard drives on both SATA and standard power. Thing will power fine with two but shuts off with three.

Think this is a bunk PSU?

I would expect a little more umph from an 850W PSU.