Pump and PSU problem

[ichabod crane]

I bourght a new coolermaster PSU today, and it doenst work when my pump is connect to it, im currently hotwiring it cable green-black, if i connect fans and stuff it works but as soon as i connect the pump it turns off after bout a second. any ideas??

my pump works fine hot wired on my old PSU.

thanks

 

[ichabod crane]

ive got it going seems that it wont start unless its got a few items drawing a fair current from it, and wont let me hotwire it either. but with the whole pc going its working a charm

its a CM real power 550w