Lenovo Thinkserver RD350 PSU Amber Light on front, both green on the PSUs themselves?

Hello everyone.

I have a Lenovo Thinkserver RD350 whose PSU LED on the front is now amber.  Note however when I look at the back of the server and at the actual two PSUs I can see that both of their power LEDs are green.  Also, when I look at the configuration tab-->Health Status-->Power in the vSphere Client I can see that PSU1 Power Supply AC Lost - Assert has an alert on it.  

So what I am asking is, is this an indication that the PSU it's self is bad or rather that there is no power going to it for some reason?  IE the cable is bad etc.  Both PSU are running off of the same UPS which seems to be fine.

Also if it is the PSU that is dead, lol, if both lights are green on the units them selves, how do I know which one to swap out?

The PSU model in question is probably this one according to part number lookup...

https://www.amazon.ca/Genuine-Lenovo-Thinkserver-Supply-03X4370/dp/B01MU8YRKH

Thanks for all help.
CnicNVAsked:
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andyalderSaggar maker's framemakerCommented:
It only needs one PSU to power on so that's unlikely. There's standby power coming out of the PSU as the amber light is on the front. Probably the motherboard assuming you've pressed the power button a few times.
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CnicNVAuthor Commented:
Hi Handy Holder, so if I understand you correctly, you are saying there is not a problem with the either of the PSUs, but rather that the amber PSU light on the front of the server indicates something else with the PSU?  What does it mean then?  Standby power?  I have not pressed the power button at all.

Again thanks for the info.
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andyalderSaggar maker's framemakerCommented:
Pressing the power button might be a good idea.
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CnicNVAuthor Commented:
You want me to press the power button...on a live server...hosting a bunch of VMs?
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andyalderSaggar maker's framemakerCommented:
Surely you have a maintenance window where you can shut it down and re-seat both PSUs?
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CnicNVAuthor Commented:
Ok, so you are thinking both PSUs need to be re-seated.  Are they that susceptible to chip creep like symptoms?  Recall the status lights on both PSUs themselves are green.  I am wondering if this is a predictive failure.  Information in the manual (see attached screenshot) does not seem to provide for the particular permutation of issue I am having.

I may just power down and up the server to see if that clears the front panel amber alert.  Who knows, it may even trigger the back PSU LED to change from green to amber.

Weird.
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CnicNVAuthor Commented:
An update.  My server is a RD330, not a RD350...sorry.  But I am thinking the issue I am experiencing maybe related to this thread...

https://forums.lenovo.com/t5/forums/v3_1/forumtopicpage/board-id/sx05_eg/thread-id/5/page/3
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CnicNVAuthor Commented:
Thanks for your help Handy Holder.  Turns out shutting down the host got the amber light to clear.  I did not need to re-seat anything however.  

For reason as to why powering it down helped, please see the Lenovo forum post I linked in my solution.
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