Hi Guys
 
A friend of mine told me his computer was not booting since he replaced his power supply and asked me to look at it.  After trying several different things I discovered that when I had the SATA power cable connected to any of the 3 ports on the power supply the computer would boot when pressing the power button.  The only thing that would happen is a light would blink for a second and then it was off.  If I left the cable disconnected from the PSU the system would start up fine.  Well up to the point of no boot device found because there was no power going to hard drive.  I'm hoping that it is just a bad cable but I am unable to test because my friend is out of town right now and I only have the one SATA power cable and a PERIF cable.  The PERIF cable is powering the case fans.  Can I stick the SATA cable into one of the PERIF connections on the PSU or the PERIF cable into the SATA connection in order to determine if its the connection or the cable?  Didn't want to just go and try it before asking first.  Any other suggestions would be very helpful.
 
Thanks.

Connected sata power cord to perif psu port and system did not boot. Connected perif cable to sata port on psu with sata cable disconnected and system booted. Think its safe to say its just a bad cable.