Antec CP-850 PSU modular part not powering hard drives properly?

[NShukla]

Hey guys, I have a very specific problem that is difficult to google, so I'd thought I'd ask here, and would appreciate any help.

I have a pretty standard build with an Antec CP-850 power supply, it's huge, well cooled, and known as extremely reliable. My build does not use nearly as much power as I have.

I used to run the one cable with 3 different SATA connectors on one cable and connect my 3 hard drives, but when I bought an SSD I needed to use another cable. I used another cable with SATA connectors and connected it to the modular part. With the modular cable, I connected one hard drive and the SSD, and with the main cable, connected 2 other hard drives. Here's the issue:

The computer cannot find the boot disk roughly 30% of the time I restart the computer. When I switched the cable connections to test it, the hard drives that were connected to the modular part didn't show up 30% of the time. I have no clue what is going on: I doubt the power supply is faulty because it's known as very reliable and I take care of my system (no crazy overclocks/whatnot).

TL;DR - Good power supply has modular part: hard drives connected to the modular part don't boot up 30% of the time.

Thanks a lot for all your help!

 

[lonewolf7]

How old is your PSU? Do you check with another modular cables? How old is your MB? Do all the SATA ports on your MB function correctly? A good PSU may fail keep that in mind.

 

[NShukla]

How old is your PSU? Do you check with another modular cables? How old is your MB? Do all the SATA ports on your MB function correctly? A good PSU may fail keep that in mind.

Thanks for the reply. My PSU is only 2 years old, the MOBO is a P7P55D 1156. I tried different SATA ports and the same problem happened. I'll try other modular cables, would the quality of the cable make a difference? I'd be inclined to think it's the PSU, but this one is well regarded as a good PSU, and I have always had the comp in optimal heat and have clean power.

 

[lonewolf7]

Nope the quality of the cables will not make a big difference. Try another PSU if you could. As for your original question............ HDD's not showing up in windows explorer or not powering up. Both problems are different.