PSU problem....sort of

[zyonuf79]

I have the following PSU:

Rosewill RP600S-2MK ATX12V 600 W

Everything works great and I never have any power problems. Then, I shut down my computer, leave it over night, then I come back and the power light on the mobo is off and I cannot turn the computer on. To get the power to come back to the computer, I have to flip the master power switch on the PSU, wait a few seconds, then flip it back. Only then will power return as normal. The PSU is plugged into a UPS so there will never be a loss of line power to the PSU and everything else plugged into the UPS (monitor, light, speakers) have power.

Is this some kind of power saving feature or a flaw in the PSU?

Thanks for the help

 

[zyonuf79]

bump for an answer

 

[joemama]

Have you tried plugging the psu into a power strip/surge protector instead of the UPS to rule out that as the problem?