[Core p5 Pcie extender Cable]

I'm having the same issue.  I can get my build to boot once every so many tries directly to the BIOS.  The best I've come up with is that setting the PCI-e slot to Gen1 (which is NOT ok with me).  I'm shopping around for a better riser currently 

[core p5 + pipe problem Water Cooling]

Core p5 is not an all-in-one cooler compatible case.  

[CORE P5 Builders Club]

Here is my work in progress. I had it all together only to find out that my riser cable is defective

I plan to change it over to hard tubing someday, but I just used what I had leftover from my Urban 81 build.