MP 1,1-5,1 RED LED lights

[Fotopete]

Recently purchased newer system, (past 60 days), 2010 5,1 6core 3.46, 32GB ram samsung. Put computer to sleep and when I return had constant red lights for OVTMP CPUA & OVTMP CPUB. When I push DIAG LED, red ones stay on and 5V STBY lights yellow. Those are only lights inside that light. Pushing "power on" button does nothing, no shutdown, no lights change. Must unplug to turn off.
This mac was listed as complete re-build. Mostly using OSX10.9 on raid startup pci sonnet TSATA6-SSD-E2.
Have osx10.13 bay 1 when needed. Mac in constant AC room.

From online research I suspect power supply failure or CPU tray overheated. Thanks for any assistance.
PS: contacted seller but zero reply.

 

[mertisrules]

Recently purchased newer system, (past 60 days), 2010 5,1 6core 3.46, 32GB ram samsung. Put computer to sleep and when I return had constant red lights for OVTMP CPUA & OVTMP CPUB. When I push DIAG LED, red ones stay on and 5V STBY lights yellow. Those are only lights inside that light. Pushing "power on" button does nothing, no shutdown, no lights change. Must unplug to turn off.
This mac was listed as complete re-build. Mostly using OSX10.9 on raid startup pci sonnet TSATA6-SSD-E2.
Have osx10.13 bay 1 when needed. Mac in constant AC room.

From online research I suspect power supply failure or CPU tray overheated. Thanks for any assistance.
PS: contacted seller but zero reply.

Avoid jumping to conclusions and start with minimum configuration testing. Search for Mac Pro repair manual and follow it to the letter.

 

[Fotopete]

Thanks - will do and update

 

[KeesMacPro]

The Technician Guide :

http://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf

Check the NorthBridge heatsink rivets too, they're made of plastic and after many years can break which results in very high NB Temps.