blowing power supplies

I'm blowing up power supplies like mad.

Working with a SuperMicro X9DRD-iF motherboard and a Thermaltake 240-pin 1275w power supply.  I'm mostly playing here...not mission critical.

So, I put the board into a case, connected the power supply and some drives and booted and it was great.  I put an OS on the thing and was golden.

The next day, I asked another tech to add an additional icy dock and some more SSD drives and he did.

I booted it up the third day and immediately the UPS faulted.  Thinking the initial boot was too much for the 1500W UPS, I reset it and booted again and the UPS faulted again.

On the third attempt, I popped the power supply and it's dead.  Two more power supplies and they are dead too.

I'm thinking the board is grounded or something, as this machine worked fine two days ago.

So, now, I have a new PS AND a new MB, but I need to find out why it's faulting.  

Any ideas on what's up?

I stripped it down to just the MB and five plugs.  The 24 pin, the two 8 pin connectors from the PS to the MB and the power and reset switches are connected.  Of course, two processors and RAM (probably blown too) but still no joy.

What can I check to see what's blowing the power supply?  Is the BM grounded?  What can I check?

Thanks

Cliff
crp0499CEOAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
It was common (way back in the day) to use some of the case standoffs for grounding the motherboard.  You could try putting tape or something between the motherboard and the standoff, and between the motherboard and the screw to see if that helps.

To eliminate peripherals, assemble the computer outside the case.  If the problem repeats, it's not the case.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I booted it up the third day and immediately the UPS faulted.  Thinking the initial boot was too much for the 1500W UPS, I reset it and booted again and the UPS faulted again.

Possible load too great for UPS?

What is the UPS spec and PSU spec ?

We always build outside of case to test first before inserting into a case...
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WakeupSpecialist 1Commented:
I'm with Andrew on that.  UPS could be the issue.  Try building outside of case as stated, but do not use the UPS.  Perhaps the UPS is causing the issue.
Also potentially bad wiring in the wall.  But would not be an issue if the UPS is decently rated...What UPS is it?  

Try a different power socket on a different circuit.
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crp0499CEOAuthor Commented:
as a followup, I finally replaced the case with a new case and things are working as expected.  I can honestly say, that's the maybe second time I've seen a grounded case blowing up power supplies in the 30 odd years I've been doing this.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It happens, we use Open Test Benches these days, to check all is working before moving into a case.
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